from:"Michael Hausenblas"

Frans,

I had a quick look. But I could not find it. I had a closer look now
and I see the URI probably is http://dbpedia.org/void/Dataset. I
have tried it. Redirection to either HTML or RDF seems to be in
place. HTML request lead to http://dbpedia.org/void/page/Dataset,
which shows a table of VoID properties. The RDF redirection (to http://dbpedia.org/void/data/Dataset.rdf)
does not seem to work, I get an error.

Sorry, you lost me here. Did you curl it or how did you get your
findings?

Apart from the error, somehow this is not what I expected. I assumed
that the dataset URI is the URI of a dataset. It is the key to all
other data. If you want something from a dataset, you only need to
know this URI. So why is the dataset URI hard to find? Why isn't it
used when references are made to DBpedia? Why isn't it the same as
the base URI (http://dbpedia.org)?.

http://lod-cloud.net/dbpedia a void:Dataset;
foaf:homepage http://dbpedia.org/;

Says everything, or?

Probably VoID metadata/dataset URIs will be easier to discover once
the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.

Agreed. But it's not a 'trick'. It's called a standard.

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 22 Jul 2011, at 09:42, Frans Knibbe wrote:

On 2011-07-21 16:27, Michael Hausenblas wrote:

But is this really common practice nowadays? Take DBpedia for
example. What is the URI of the DBpedia dataset? Is it http://dbpedia.org?
That does not seem to resolve to a set of metadata.

Did you have a look at the URI I gave you? I mean http://lod-cloud.net/void.ttl
I had a quick look. But I could not find it. I had a closer look now
and I see the URI probably is http://dbpedia.org/void/Dataset. I
have tried it. Redirection to either HTML or RDF seems to be in
place. HTML request lead to http://dbpedia.org/void/page/Dataset,
which shows a table of VoID properties. The RDF redirection (to http://dbpedia.org/void/data/Dataset.rdf)
does not seem to work, I get an error.

Probably VoID metadata/dataset URIs will be easier to discover once
the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.

BTW, some 30% [1] of the LOD cloud datasets are using VoID ...

Is there a general way of obtaining datasets URIs?

Not to my knowledge. We're working on it in LATC [2] - Keith?

Cheers,
Michael

[1] http://www4.wiwiss.fu-berlin.de/lodcloud/state/#data-set-level-metadata
[2] http://latc-project.eu/

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 Jul 2011, at 15:19, Frans Knibbe wrote:

Thanks for the replies. It seems that there is agreement that a
dataset should have a URI and that dereferencing that URI should
return metadata about the dataset. That is good to know.

But is this really common practice nowadays? Take DBpedia for
example. What is the URI of the DBpedia dataset? Is it http://dbpedia.org?
That does not seem to resolve to a set of metadata.

Is there a general way of obtaining datasets URIs?

I can imagine an RDF dataset comprising all known dataset URIs.
And of course that dataset will have a URI itself. Does such a
dataset exist at the moment?

Regards,
Frans

On 2011-07-21 12:35, Frans Knibbe wrote:

Hello,

I have just placed a Linked Data dataset online and now I am
struggling with finding the best way to publish the metadata of
the dataset. I wonder if there are best practices for referencing
a dataset and its metadata, and for linking the two.

I did find out that using the Vocabulary of Interlinked Data
(VoID) is a good way to publish the metadata of a dataset. But I
still need some guidance. I have come up with three questions:

1) Is it common practice/recommendable to regard a dataset a
resource? If it is, then all datasets should have a URI, right?
2) If having a dataset URI is a good thing, what should be behind
the URI? Should dereferencing the URI lead to the dataset
metadata (a VoID file for example)?
3) If dereferencing a dataset URI leads to the dataset metadata

Re: Dataset URIs and metadata.

So, does this mean that the URI of the dataset (DBPedia) is http://lod-cloud.net/dbpedia?
?

It is one URI identifying the DBpedia dataset, yes. It is likely not
the authoritative one as it is not int the dbpedia.org namespace, so
there may be others ...

On 22 Jul 2011, at 11:16, Frans Knibbe wrote:

Hello Michael,

On 2011-07-22 10:59, Michael Hausenblas wrote:

Frans,

I had a quick look. But I could not find it. I had a closer look
now and I see the URI probably is http://dbpedia.org/void/Dataset.
I have tried it. Redirection to either HTML or RDF seems to be in
place. HTML request lead to http://dbpedia.org/void/page/Dataset,
which shows a table of VoID properties. The RDF redirection (to http://dbpedia.org/void/data/Dataset.rdf)
does not seem to work, I get an error.

Sorry, you lost me here. Did you curl it or how did you get your
findings?

Yes, I tried curl. I have just tried it again:

curl -H Accept: application/rdf+xml http://dbpedia.org/void/data/Dataset.rdf

The response seems to be different from yesterday. Yesterday I
immediately got an error message. I am afraid I don't have the exact
message any more. The response I get now is different, a transaction
time out, which I get after waiting a bit.

Probably this is just a temporary situation and besides the point too.

Apart from the error, somehow this is not what I expected. I
assumed that the dataset URI is the URI of a dataset. It is the
key to all other data. If you want something from a dataset, you
only need to know this URI. So why is the dataset URI hard to
find? Why isn't it used when references are made to DBpedia? Why
isn't it the same as the base URI (http://dbpedia.org)?.

http://lod-cloud.net/dbpedia a void:Dataset;
foaf:homepage http://dbpedia.org/;

Says everything, or?

Well, let me see...

First of all, please know that I am new to Linked Data and RDF, so
there is a chance I don't fully understand everything.

I think what it says is that there is a thing identified by the URI http://lod-cloud.net/dbpedia
, that that thing is a dataset and that its home page is http://dbpedia.org/
.

So, does this mean that the URI of the dataset (DBPedia) is http://lod-cloud.net/dbpedia?
?

Sorry if I seem to be stupid, it is not my intention.

Probably VoID metadata/dataset URIs will be easier to discover
once the /.well-known/void trick (described in paragraph 7.2 of
the W3C VoID document) is widely adopted.

Agreed. But it's not a 'trick'. It's called a standard.

Sorry about that!

Regards,
Frans

On 22 Jul 2011, at 09:42, Frans Knibbe wrote:

On 2011-07-21 16:27, Michael Hausenblas wrote:

But is this really common practice nowadays? Take DBpedia for
example. What is the URI of the DBpedia dataset? Is it http://dbpedia.org?
That does not seem to resolve to a set of metadata.

Did you have a look at the URI I gave you? I mean http://lod-cloud.net/void.ttl
I had a quick look. But I could not find it. I had a closer look
now and I see the URI probably is http://dbpedia.org/void/Dataset.
I have tried it. Redirection to either HTML or RDF seems to be in
place. HTML request lead to http://dbpedia.org/void/page/Dataset,
which shows a table of VoID properties. The RDF redirection (to http://dbpedia.org/void/data/Dataset.rdf)
does not seem to work, I get an error.

Apart from the error, somehow this is not what I expected. I
assumed that the dataset URI is the URI of a dataset. It is the
key to all other data. If you want something from a dataset, you
only need to know this URI. So why is the dataset URI hard to
find? Why isn't it used when references are made to DBpedia? Why
isn't it the same as the base URI (http://dbpedia.org)?.

Probably VoID metadata/dataset URIs will be easier to discover
once the /.well-known/void trick (described in paragraph 7.2 of
the W3C VoID document) is widely adopted.

BTW, some 30% [1] of the LOD cloud datasets are using VoID ...

Is there a general way of obtaining datasets URIs?

Not to my knowledge. We're working on it in LATC [2] - Keith?

Cheers,
Michael

[1] http://www4.wiwiss.fu-berlin.de/lodcloud/state/#data-set-level-metadata
[2] http://latc-project.eu/

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland

Re: Dataset URIs and metadata.





Probably VoID metadata/dataset URIs will be easier to discover once
the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?


Yes, I think that RFC5785 [1] can be considered a standard. Unless you  
want to suggest that RFCs are sorta not real standards :P


Cheers,
Michael

[1] http://tools.ietf.org/html/rfc5785
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 22 Jul 2011, at 15:39, Dave Reynolds wrote:


On Fri, 2011-07-22 at 09:59 +0100, Michael Hausenblas wrote:

Frans,


[snip]


Probably VoID metadata/dataset URIs will be easier to discover once
the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?

There was me thinking it was a Interest Group Note.

Is there a newer version than:
http://www.w3.org/TR/2011/NOTE-void-20110303/

?

Dave

Re: Dataset URIs and metadata.


It was the the claim that /.well-known/void is a standard that I was
surprised by. It's the sort of thing that could easily be on a Rec  
track

somewhere, I just wasn't aware of it.



Sorry if I somehow gave the impression that VoID is a W3C  
Recommendation. I would consider it as a de-facto standard in the  
Linked Data community. Formally, though it is a W3C Note, yes.


Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 22 Jul 2011, at 16:12, Dave Reynolds wrote:


On Fri, 2011-07-22 at 15:42 +0100, Michael Hausenblas wrote:


Probably VoID metadata/dataset URIs will be easier to discover  
once

the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?


Yes, I think that RFC5785 [1] can be considered a standard. Unless  
you

want to suggest that RFCs are sorta not real standards :P


:)

I'm aware that /.well-known is standardized in RFC5785.

It was the the claim that /.well-known/void is a standard that I was
surprised by. It's the sort of thing that could easily be on a Rec  
track

somewhere, I just wasn't aware of it.

FWIW I'm perfectly happy with VoID's current status as an Interest  
Group

note.

Cheers,
Dave


On 22 Jul 2011, at 15:39, Dave Reynolds wrote:


On Fri, 2011-07-22 at 09:59 +0100, Michael Hausenblas wrote:

Frans,


[snip]

Probably VoID metadata/dataset URIs will be easier to discover  
once

the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?

There was me thinking it was a Interest Group Note.

Is there a newer version than:
http://www.w3.org/TR/2011/NOTE-void-20110303/

?

Dave

Re: Dataset URIs and metadata.



Patrick,



So, perhaps one day it will be a standard, but not today.



Good catch! Did you join the Pedantic Web [1] group, yet? We need more  
people like you.



Hope you are nearing a great weekend!


Yes, indeed, I plan to go to DERI FAWM now and allow my brain to be  
off-line till 15:00 UTC tomorrow, in case anyone cares ...



Cheers,
Michael

[1] http://pedantic-web.org/
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 22 Jul 2011, at 16:11, Patrick Durusau wrote:


Michael,

On 7/22/2011 10:42 AM, Michael Hausenblas wrote:




Probably VoID metadata/dataset URIs will be easier to discover  
once

the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?


Yes, I think that RFC5785 [1] can be considered a standard. Unless  
you want to suggest that RFCs are sorta not real standards :P


RFCs can be standards, but there is a path by which RFCs become  
standards.


As of today, the RFC 5785 header reads PROPOSED STANDARD.

So, perhaps one day it will be a standard, but not today.

Hope you are nearing a great weekend!

Patrick



Cheers,
   Michael

[1] http://tools.ietf.org/html/rfc5785
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 22 Jul 2011, at 15:39, Dave Reynolds wrote:


On Fri, 2011-07-22 at 09:59 +0100, Michael Hausenblas wrote:

Frans,


[snip]

Probably VoID metadata/dataset URIs will be easier to discover  
once

the /.well-known/void trick (described in paragraph 7.2 of the W3C
VoID document) is widely adopted.


greed. But it's not a 'trick'. It's called a standard.


Is it?

There was me thinking it was a Interest Group Note.

Is there a newer version than:
http://www.w3.org/TR/2011/NOTE-void-20110303/

?

Dave







--
Patrick Durusau
patr...@durusau.net
Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)

Another Word For It (blog): http://tm.durusau.net
Homepage: http://www.durusau.net
Twitter: patrickDurusau

Re: Dataset URIs and metadata.

2011-07-21 Thread Michael Hausenblas



Frans,

Please refer to http://www.w3.org/TR/void/ as this is the official  
Note ...



1) Is it common practice/recommendable to regard a dataset a  
resource? If it is, then all datasets should have a URI, right?


Yes, all datasets (and sub-sets) should have a URI.


2) If having a dataset URI is a good thing, what should be behind  
the URI? Should dereferencing the URI lead to the dataset metadata  
(a VoID file for example)?



As described in http://www.w3.org/TR/void/#discovery

3) If dereferencing a dataset  URI leads to the dataset metadata,  
should there be separate HTML and RDF versions of the metadata? Or  
is it better to have a HTML page with embedded (RDFa) RDF data?


Up to you. If you want to be Linked Data compliant (remember the 3rd  
principle ;) than you'll serve *some* structured data from the URI.  
RDFa is just as fine as anything else there, really.


You might be interested to learn about the 'bigger' picture via 
http://linked-data-life-cycles.info

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 Jul 2011, at 11:35, Frans Knibbe wrote:


Hello,

I have just placed a Linked Data dataset online and now I am  
struggling with finding the best way to publish the metadata of the  
dataset. I wonder if there are best practices for referencing a  
dataset and its metadata, and for linking the two.


I did find out that using the Vocabulary of Interlinked Data (VoID)  
is a good way to publish the metadata of a dataset. But I still need  
some guidance. I have come up with three questions:


1) Is it common practice/recommendable to regard a dataset a  
resource? If it is, then all datasets should have a URI, right?
2) If having a dataset URI is a good thing, what should be behind  
the URI? Should dereferencing the URI lead to the dataset metadata  
(a VoID file for example)?
3) If dereferencing a dataset  URI leads to the dataset metadata,  
should there be separate HTML and RDF versions of the metadata? Or  
is it better to have a HTML page with embedded (RDFa) RDF data?


Thanks in advance for your help,
Frans

Re: Dataset URIs and metadata.

2011-07-21 Thread Michael Hausenblas



Frans,

Forgot two things, sorry:

http://lod-cloud.net/void.ttl might provide you with some URI's for  
interlinking descriptions and we have a separate VoID discussion group  
[1] if you want to go into greater details ;)


Cheers,
Michael

[1] https://groups.google.com/forum/?pli=1#!forum/void-discussion
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 Jul 2011, at 11:43, Michael Hausenblas wrote:



Frans,

Please refer to http://www.w3.org/TR/void/ as this is the official  
Note ...



1) Is it common practice/recommendable to regard a dataset a  
resource? If it is, then all datasets should have a URI, right?


Yes, all datasets (and sub-sets) should have a URI.


2) If having a dataset URI is a good thing, what should be behind  
the URI? Should dereferencing the URI lead to the dataset metadata  
(a VoID file for example)?



As described in http://www.w3.org/TR/void/#discovery

3) If dereferencing a dataset  URI leads to the dataset metadata,  
should there be separate HTML and RDF versions of the metadata? Or  
is it better to have a HTML page with embedded (RDFa) RDF data?


Up to you. If you want to be Linked Data compliant (remember the 3rd  
principle ;) than you'll serve *some* structured data from the URI.  
RDFa is just as fine as anything else there, really.


You might be interested to learn about the 'bigger' picture via 
http://linked-data-life-cycles.info

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 Jul 2011, at 11:35, Frans Knibbe wrote:


Hello,

I have just placed a Linked Data dataset online and now I am  
struggling with finding the best way to publish the metadata of the  
dataset. I wonder if there are best practices for referencing a  
dataset and its metadata, and for linking the two.


I did find out that using the Vocabulary of Interlinked Data (VoID)  
is a good way to publish the metadata of a dataset. But I still  
need some guidance. I have come up with three questions:


1) Is it common practice/recommendable to regard a dataset a  
resource? If it is, then all datasets should have a URI, right?
2) If having a dataset URI is a good thing, what should be behind  
the URI? Should dereferencing the URI lead to the dataset metadata  
(a VoID file for example)?
3) If dereferencing a dataset  URI leads to the dataset metadata,  
should there be separate HTML and RDF versions of the metadata? Or  
is it better to have a HTML page with embedded (RDFa) RDF data?


Thanks in advance for your help,
Frans

Re: Dataset URIs and metadata.

2011-07-21 Thread Michael Hausenblas



But is this really common practice nowadays? Take DBpedia for  
example. What is the URI of the DBpedia dataset? Is it http://dbpedia.org? 
 That does not seem to resolve to a set of metadata.


Did you have a look at the URI I gave you? I mean http://lod-cloud.net/void.ttl

BTW, some 30% [1] of the LOD cloud datasets are using VoID ...


Is there a general way of obtaining datasets URIs?


Not to my knowledge. We're working on it in LATC [2] - Keith?

Cheers,
Michael

[1] http://www4.wiwiss.fu-berlin.de/lodcloud/state/#data-set-level-metadata
[2] http://latc-project.eu/

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 Jul 2011, at 15:19, Frans Knibbe wrote:



Thanks for the replies. It seems that there is agreement that a  
dataset should have a URI and that dereferencing that URI should  
return metadata about the dataset. That is good to know.


But is this really common practice nowadays? Take DBpedia for  
example. What is the URI of the DBpedia dataset? Is it http://dbpedia.org? 
 That does not seem to resolve to a set of metadata.


Is there a general way of obtaining datasets URIs?

I can imagine an RDF dataset comprising all known dataset URIs. And  
of course that dataset will have a URI itself. Does such a dataset  
exist at the moment?


Regards,
Frans


On 2011-07-21 12:35, Frans Knibbe wrote:


Hello,

I have just placed a Linked Data dataset online and now I am  
struggling with finding the best way to publish the metadata of the  
dataset. I wonder if there are best practices for referencing a  
dataset and its metadata, and for linking the two.


I did find out that using the Vocabulary of Interlinked Data (VoID)  
is a good way to publish the metadata of a dataset. But I still  
need some guidance. I have come up with three questions:


1) Is it common practice/recommendable to regard a dataset a  
resource? If it is, then all datasets should have a URI, right?
2) If having a dataset URI is a good thing, what should be behind  
the URI? Should dereferencing the URI lead to the dataset metadata  
(a VoID file for example)?
3) If dereferencing a dataset  URI leads to the dataset metadata,  
should there be separate HTML and RDF versions of the metadata? Or  
is it better to have a HTML page with embedded (RDFa) RDF data?


Thanks in advance for your help,
Frans

A proposal for handling bulk data requests

2011-07-11 Thread Michael Hausenblas



Kingsley, Gio, All,


An idea that arose out of a recent discussion with Juergen (in CC):  
how about providing a sort of 'bulk data request' facility for your  
SPARQL endpoints [1] [2] (as they are, I gather, the more popular ones  
on the WoD ;)?


It could work as follows:


1. Someone uploads a VoID description [3] of the targeted datasets and  
provides an email, Twitter, G+ handle or a WebID


2. You could generate the 'customized' dataset internally in a very  
efficient manner.


3. Once available, the requester is notified by means of the provided  
back-channel from 1.



I believe such a system in place would lower the crawling and bulk- 
query costs re bandwidth, etc. on your end, and opens up a business  
opportunity as well (think: WebID - Web Payments).



What do you think?

Cheers,
Michael

[1] http://lod.openlinksw.com/sparql
[2] http://sparql.sindice.com/
[3] http://www.w3.org/TR/void/

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: HTTP status for timed-out SPARQL query

2011-06-28 Thread Michael Hausenblas




Should we be returning 500 instead?


Yes. To be more concise, I'd think that 503 [1] is appropriate. A 4xx  
is not appropriate IMHO, because [2]:


[[
The 4xx class of status code is intended for cases in which the client  
seems to have erred.

]]

Cheers,
Michael

[1] http://tools.ietf.org/html/rfc2616#section-10.5.4
[2] http://tools.ietf.org/html/rfc2616#section-10.4
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 28 Jun 2011, at 07:21, Bill Roberts wrote:

Looking for some advice from the community.  If we time out a slow- 
running SPARQL query, what is the most appropriate HTTP status code  
to return to the client?  We had been trying 408, but the problem  
with that is that some clients (notably Firefox) take it on  
themselves to keep retrying the request, which isn't really what we  
want.


Should we be returning 500 instead?

Thanks

Bill

Re: HTTP status for timed-out SPARQL query

2011-06-28 Thread Michael Hausenblas





Seriously, I think that
  413 Request Entity Too Large

would be a good solution:



I disagree. Just checked back w/ colleagues on the #rest IRC channel,  
they also agree with 503.


Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 28 Jun 2011, at 11:10, Martin Hepp wrote:



Looking for some advice from the community.  If we time out a slow- 
running SPARQL query, what is the most appropriate HTTP status code  
to return to the client?  We had been trying 408, but the problem  
with that is that some clients (notably Firefox) take it on  
themselves to keep retrying the request, which isn't really what we  
want.


Should we be returning 500 instead?


What about
  402 Payment Required?

;-)

Seriously, I think that
  413 Request Entity Too Large

would be a good solution:

The server is refusing to process a request because the request  
entity is larger than the server is willing or able to process. The  
server MAY close the connection to prevent the client from  
continuing the request.


If the condition is temporary, the server SHOULD include a Retry-  
After header field to indicate that it is temporary and after what  
time the client MAY try again.


500 Internal Server Error was also my first guess, but this may not  
stop clients from trying again.


Martin

On Jun 28, 2011, at 8:21 AM, Bill Roberts wrote:

Looking for some advice from the community.  If we time out a slow- 
running SPARQL query, what is the most appropriate HTTP status code  
to return to the client?  We had been trying 408, but the problem  
with that is that some clients (notably Firefox) take it on  
themselves to keep retrying the request, which isn't really what we  
want.


Should we be returning 500 instead?

Thanks

Bill

Re: Java Language Ontology and .java to RDF parser?

2011-06-26 Thread Michael Hausenblas



Aldo,


Does anyone know of a Java language ontology? ( with a JavaClass,
JavaMethod, JavaField, etc classes, for example. ).
And a parser for such an ontology? ( that takes .java sources as  
input ).


Yes, see [1]. Ping Aftab (one of my PhD students, in CC) if you need  
more details ...


Cheers,
Michael

[1] Aftab Iqbal, Oana Ureche, Michael Hausenblas, Giovanni Tummarello.
LD2SD: Linked Data Driven Software Development, 21st  
International Conference on Software Engineering and Knowledge  
Engineering, 2009.

http://sw-app.org/pub/seke09-ld2sd.pdf

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 26 Jun 2011, at 08:28, Aldo Bucchi wrote:


Hi,

Does anyone know of a Java language ontology? ( with a JavaClass,
JavaMethod, JavaField, etc classes, for example. ).
And a parser for such an ontology? ( that takes .java sources as  
input ).


I need to analyze some Java codebases and it would be really useful to
create an in memory graph of the language constructs, particularly in
RDF, so I could use some of the amazing tools that we all know and
love ;)

Thanks!
A

--
Aldo Bucchi
@aldonline
skype:aldo.bucchi
http://facebook.com/aldo.bucchi ( -- add me * )
http://aldobucchi.com/
* I prefer Facebook as a networking
and communications tool.

Re: URI Owners

2011-06-15 Thread Michael Hausenblas



Do URIs have owners? I don't thing owner is the correct term. A  
URI has an agent (person, group) who controls what it resolves to,  
but I'm not sure you can own an identifier.


http://www.w3.org/TR/webarch/#uri-assignment

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 15 Jun 2011, at 11:58, Christopher Gutteridge wrote:


Picking up on comment by Richard, but forking the thread

Would you agree that Facebook are the owners of this URI?

Do URIs have owners? I don't thing owner is the correct term. A  
URI has an agent (person, group) who controls what it resolves to,  
but I'm not sure you can own an identifier.


--
Christopher Gutteridge -- http://id.ecs.soton.ac.uk/person/1248

/ Lead Developer, EPrints Project, http://eprints.org/
/ Web Projects Manager, ECS, University of Southampton, 
http://www.ecs.soton.ac.uk/
/ Webmaster, Web Science Trust, http://www.webscience.org/

Re: Schema.org in RDF ...

2011-06-12 Thread Michael Hausenblas



Alan,



Again, this strikes me as speaking from very little experience. I
spend a good deal of my time collaboratively developing ontologies and
working with users of them. I've yet to encounter a person who didn't
understand the difference between a book about Obama and Obama.



Welcome to the real world.

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 12 Jun 2011, at 11:12, Alan Ruttenberg wrote:


On Sunday, June 12, 2011, Lin Clark lin.w.cl...@gmail.com wrote:




David, as you know, it is trivial to distinguish in representation  
the difference between an information object and a person. I don't  
understand why you keep repeating this misinformation.


-Alan


It is trivial to distinguish between an information resource and  
the resource it talks about


There is no if. In the below you are talking about matters other
than being able to make the distinction.

if you are 1) developing a custom system under your control for  
your own needs, which is not extensible and does not have to  
integrate code published by developers with a different knowledge  
base than you


Please give me some evidence for this. My experience (not
insignificant) is otherwise.

 -and- 2) do not have end users who you have to educate in the  
distinction between an info resource and an other web resource so  
that they can effectively add content to your system.


Again, this strikes me as speaking from very little experience. I
spend a good deal of my time collaboratively developing ontologies and
working with users of them. I've yet to encounter a person who didn't
understand the difference between a book about Obama and Obama.

However, it is not trivial to add this distinction when you are  
working in an extensible system which you do not control


It depends on the manner in which the system is made extensible.
Architecture and good design matters. However, It is this attitude
that has led, in part, to the prulgation of schema.org as a closed
architecture.


or when you do not have the resources to invest in reeducation

camps to change the way end users and other developers think.

As an educator, in part, I do not consider educating people to require
investing in reeducation camps. In my opinion, if you want to build a
system by which data can be effectively aggregated and put to novel
use by machines (this is what I thought we were doing) then I think
you will fail if you think that will come by continuing to set no
standards for how these systems communicate meaning and what kind of
knowledge someone needs to have to work with them correctly. i cite
the experience of the last 50 years of computer technology as
evidence.

-Alan





I invite anyone who disagrees and who believes this is trivial to  
actually try effectively communicating the distinction made by  
httpRange-14 to an outside technology community and to attempt the  
social change necessary to make it work consistently in practice.


Best,Lin

Re: ANN: alpha version of Schema.org terms-to-RDF translator 'omnidator' available

2011-06-12 Thread Michael Hausenblas




Great job!



Thanks. Not a real competitor to URIBurner, though ;)


Little note, please tweak your Microdata tools description of the  
Virtuoso Sponger since URIBurner.com [1] delivers the same  
functionality of omnidator across the formats you mention + OData  
etc.. Alternatively, you can add URIBurner to the Microdata tools  
list [2].



Done, see http://schema.rdfs.org/tools.html

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 11 Jun 2011, at 23:35, Kingsley Idehen wrote:


On 6/11/11 6:08 PM, Michael Hausenblas wrote:


All,


The alpha version of omnidator [1] (omnipotent data translator), an  
online tool and (CORS-enabled) API to translate formats that use  
Schema.org terms into RDF is now available.


Currently only microdata and CSV as input formats are supported,  
but others (such as OData) are in the queue. Let us know what other  
formats you want omnidator to support, or, if you fancy chiming in,  
clone the repo [2] and send us a pull request.


Great job!

Little note, please tweak your Microdata tools description of the  
Virtuoso Sponger since URIBurner.com [1] delivers the same  
functionality of omnidator across the formats you mention + OData  
etc.. Alternatively, you can add URIBurner to the Microdata tools  
list [2].


Links:

1. http://uriburner.com -- note the URL input field (this has always  
been a translation service i.e., Virtuoso Sponger behind a domain)  
and the fact that it returns a URL for a Linked Data resource


2. http://schema.rdfs.org/tools.html -- Microdata tools page .

Kingsley



Cheers,
   Michael

[1] http://omnidator.appspot.com/

[2] https://github.com/mhausenblas/omnidator

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html






--

Regards,

Kingsley Idehen 
President  CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen

ANN: alpha version of Schema.org terms-to-RDF translator 'omnidator' available

2011-06-11 Thread Michael Hausenblas



All,


The alpha version of omnidator [1] (omnipotent data translator), an  
online tool and (CORS-enabled) API to translate formats that use  
Schema.org terms into RDF is now available.


Currently only microdata and CSV as input formats are supported, but  
others (such as OData) are in the queue. Let us know what other  
formats you want omnidator to support, or, if you fancy chiming in,  
clone the repo [2] and send us a pull request.


Cheers,
Michael

[1] http://omnidator.appspot.com/

[2] https://github.com/mhausenblas/omnidator

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: Schema.org in RDF ...

2011-06-09 Thread Michael Hausenblas




For how little this matters really - i'd really advice anyone wanting
to produce RDFa of schema to live with it and use direct
http://schema.org uris as per their example in RDFa.


+1

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 9 Jun 2011, at 09:54, Giovanni Tummarello wrote:


my2c

i would seriously advice against using  triples with http://schema.rdfs.org 
  .


That  would be totally and entirely validating their claim that either
you impose things or fragmentation will distroy everything and that
talking to the community is a waste of time.

For how little this matters really - i'd really advice anyone wanting
to produce RDFa of schema to live with it and use direct
http://schema.org uris as per their example in RDFa.

Gio

On Tue, Jun 7, 2011 at 9:49 AM, Patrick Logan  
patrickdlo...@gmail.com wrote:

Would it be reasonable to use  http://schema.rdfs.org rather than
http://schema.org in the URIs? Essentially mirror what one might hope
for schema.org to become. Then if it does become that, link the two
together?


On Tue, Jun 7, 2011 at 1:22 AM, Michael Hausenblas
michael.hausenb...@deri.org wrote:
Something I don't understand. If I read well all savvy  
discussions so far,
publishers behind http://schema.org URIs are unlikely to ever  
provide any

RDF description,


What makes you so sure about that not one day in the (near?)  
future the
Schema.org URIs will serve RDF or JSON, FWIW, additionally to  
HTML? ;)


Cheers,
   Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 7 Jun 2011, at 08:44, Bernard Vatant wrote:


Hi all

Something I don't understand. If I read well all savvy  
discussions so far,
publishers behind http://schema.org URIs are unlikely to ever  
provide any
RDF description, so why are those URIs declared as identifiers of  
RDFS

classes in the http://schema.rdfs.org/all.rdf. For all I can see,
http://schema.org/Person is the URI of an information resource,  
not of a

class.
So I would rather have expected mirroring of the schema.org URIs by
schema.rdfs.org URIs, the later fully dereferencable proper RDFS  
classes
expliciting the semantics of the former, while keeping the  
reference to the

source in some dcterms:source element.

Example, instead of ...

rdf:Description rdf:about=http://schema.org/Person;
rdf:type rdf:resource=http://www.w3.org/2000/01/rdf- 
schema#Class/

rdfs:label xml:lang=enPerson/rdfs:label
rdfs:comment xml:lang=enA person (alive, dead, undead, or
fictional)./rdfs:comment
rdfs:subClassOf rdf:resource=http://schema.org/Thing/
rdfs:isDefinedBy rdf:resource=http://schema.org/Person/
/rdf:Description

where I see a clear abuse of rdfs:isDefinedBy, since if you  
dereference

the said URI, you don't find any explicit RDF definition ...

I would rather have the following

rdf:Description rdf:about=http://schema.rdfs.org/Person;
rdf:type rdf:resource=http://www.w3.org/2000/01/rdf- 
schema#Class/

rdfs:label xml:lang=enPerson/rdfs:label
rdfs:comment xml:lang=enA person (alive, dead, undead, or
fictional)./rdfs:comment
rdfs:subClassOf rdf:resource=http://schema.rdfs.org/Thing/
dcterms:source rdf:resource=http://schema.org/Person/
/rdf:Description

To the latter declaration, one could safely add statements like

schema.rdfs:Person rdfs:subClassOf  foaf:Person

etc

Or do I miss the point?

Bernard

2011/6/3 Michael Hausenblas michael.hausenb...@deri.org

http://schema.rdfs.org

... is now available - we're sorry for the delay ;)

Cheers,
  Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html





--
Bernard Vatant
Senior Consultant
Vocabulary  Data Integration
Tel:   +33 (0) 971 488 459
Mail: bernard.vat...@mondeca.com

Mondeca
3, cité Nollez 75018 Paris France
Web:http://www.mondeca.com
Blog:http://mondeca.wordpress.com

Schema.RDFS.org updates

2011-06-09 Thread Michael Hausenblas



All,


Richard and I tried our best to capture all input so far [1] - please  
let us know if we've forgotten anything or anyone (if so, my bad,  
yeah, I'm a slacker ;) - further input re the mapping is very much  
appreciated via the tracker [1]!


We're currently rolling out the live-sync to Schema.org along with  
some other improvements - there is a lot to do and if you want to  
contribute via the repo, you're more than welcome.


Also, the tools section [2] has been updated: the new Drupal module,  
Virtuoso Sponger, TopBraid Composer and Ed Summer's rdflib plugin are  
now listed.


Cheers,
Michael

[1] https://github.com/mhausenblas/schema-org-rdf/issues
[2] http://schema.rdfs.org/tools.html

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: Schema.org in RDF ...

2011-06-07 Thread Michael Hausenblas

Something I don't understand. If I read well all savvy discussions  
so far, publishers behind http://schema.org URIs are unlikely to  
ever provide any RDF description,


What makes you so sure about that not one day in the (near?) future  
the Schema.org URIs will serve RDF or JSON, FWIW, additionally to  
HTML? ;)


Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 7 Jun 2011, at 08:44, Bernard Vatant wrote:


Hi all

Something I don't understand. If I read well all savvy discussions  
so far, publishers behind http://schema.org URIs are unlikely to  
ever provide any RDF description, so why are those URIs declared as  
identifiers of RDFS classes in the http://schema.rdfs.org/all.rdf.  
For all I can see, http://schema.org/Person is the URI of an  
information resource, not of a class.
So I would rather have expected mirroring of the schema.org URIs by  
schema.rdfs.org URIs, the later fully dereferencable proper RDFS  
classes expliciting the semantics of the former, while keeping the  
reference to the source in some dcterms:source element.


Example, instead of ...

rdf:Description rdf:about=http://schema.org/Person;
rdf:type rdf:resource=http://www.w3.org/2000/01/rdf-schema#Class/
rdfs:label xml:lang=enPerson/rdfs:label
rdfs:comment xml:lang=enA person (alive, dead, undead, or  
fictional)./rdfs:comment

rdfs:subClassOf rdf:resource=http://schema.org/Thing/
rdfs:isDefinedBy rdf:resource=http://schema.org/Person/
/rdf:Description

where I see a clear abuse of rdfs:isDefinedBy, since if you  
dereference the said URI, you don't find any explicit RDF  
definition ...


I would rather have the following

rdf:Description rdf:about=http://schema.rdfs.org/Person;
rdf:type rdf:resource=http://www.w3.org/2000/01/rdf-schema#Class/
rdfs:label xml:lang=enPerson/rdfs:label
rdfs:comment xml:lang=enA person (alive, dead, undead, or  
fictional)./rdfs:comment

rdfs:subClassOf rdf:resource=http://schema.rdfs.org/Thing/
dcterms:source rdf:resource=http://schema.org/Person/
/rdf:Description

To the latter declaration, one could safely add statements like

schema.rdfs:Person rdfs:subClassOf  foaf:Person

etc

Or do I miss the point?

Bernard

2011/6/3 Michael Hausenblas michael.hausenb...@deri.org

http://schema.rdfs.org

... is now available - we're sorry for the delay ;)

Cheers,
   Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html





--
Bernard Vatant
Senior Consultant
Vocabulary  Data Integration
Tel:   +33 (0) 971 488 459
Mail: bernard.vat...@mondeca.com

Mondeca
3, cité Nollez 75018 Paris France
Web:http://www.mondeca.com
Blog:http://mondeca.wordpress.com

Re: Schema.org in RDF ...

2011-06-04 Thread Michael Hausenblas



All,

Thanks a lot for the comments we received so far, both here and (even  
more) off-list. Now, to make our life a bit easier, may I ask you to  
provide suggestions concerning the mapping (or feature requests alike)  
directly to the Github [1]? Of course, if you're more into it, feel  
free to clone the repo and issue a pull request.


As you can imagine, this is a community endeavour - we just happened  
to kick it off ;)


Cheers,
Michael

[1] https://github.com/mhausenblas/schema-org-rdf/issues

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 3 Jun 2011, at 22:06, Michael Hausenblas wrote:



http://schema.rdfs.org

... is now available - we're sorry for the delay ;)

Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: See UK

2011-05-21 Thread Michael Hausenblas



Hugh,

Impressive! Or to put it a bit more formally:


 :me http://ontologi.es/like#likes http://apps.seme4.com/see-uk .


Hmmm ... I guess it's gonna be a quite competitive Open Data Challenge  
then ;)


Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 21 May 2011, at 11:51, Hugh Glaser wrote:


Hi,
Ian Millard and I have recently made public a web page that is  
perhaps quite a nice demonstrator.
It makes use of quite a lot of public UK linked data, plus data  
enrichment and cross-dataset linkage provided by the EnAKTing team  
and Seme4.

Some people would call it a Semantic Web App.
Hopefully self-explanatory and of interest to the lists:
http://apps.seme4.com/see-uk
There is an about page at
http://apps.seme4.com/see-uk/about.html
Best
Hugh

http://www.ecs.soton.ac.uk/~hg/
http://www.seme4.com/who-we-are/profile/hugh-glaser/

[CfP] IEEE Intelligent Systems Special Issue on 'Linked Open Government Data'

2011-05-11 Thread Michael Hausenblas



All,


This is the first CfP for the IEEE Intelligent Systems Special Issue  
on 'Linked Open Government Data' [1] with a submission deadline on 1  
September 2011.



Topics
==

1 Interoperable and meaningful LOGD representation

+ Space management of uniform resource identifiers and identifiers
+ Catalogs and registries for LOGD datasets
	+ Ontologies, vocabularies, and semantic annotation for large and/or  
dynamic LOGD data

+ Vocabulary management for LOGD metadata reuses and specializations
	+ Context, provenance, quality, uncertainty, and trustworthiness of  
LOGD



2 Scalable semantic data management and processing for LOGD

+ Smart integration with legacy systems, barriers, formats
	+ Extensible infrastructure for collaborative LOGD data management  
and processing

+ Smart link generation, learning, validation, and reasoning
+ Scalable LOGD data discovery, access, query, and search
+ Persistence, version freshness, and obsolescence of LOGD


3 LOGD deployment and society

+ Deployment cost and benefits
+ Transparency vs. privacy
+ Free, open data vs. business models
+ License, policy, and legal issues
+ Community engagement, best practices, and lessons learned


4 Innovative and intelligent LOGD consumption

+ User interaction models: cost reduction and usability improvements
+ Social LOGD mashups: personalization, collaboration, and trust
+ Mobile applications and mGovernment
+ Intelligent web applications using LOGD as a data source
	+ Use-cases for scientific discovery, business analysis, and  
administrative decision making




Guest Editors
=

 + Vassilios Peristeras, European Commission, Directorate-General for  
Informatics, Interoperability Solutions for European Public  
Administrations (ISA) Unit, Belgium
 + Michael Hausenblas, Linked Data Research Centre, DERI, NUI Galway,  
Ireland
 + Li Ding, Tetherless World Constellation, Rensselaer Polytechnic  
Institute, USA



For submission details and further questions, please visit [1].


Cheers,
Michael (on behalf of the Guest Editors)

[1] http://www.computer.org/intelligent/cfp2

--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: Linked Media: Extending Linked Data for Updates and arbitrary Media Formats using the REST Principles

2011-05-05 Thread Michael Hausenblas



Sebastian,

Good stuff and timely, indeed. Can you please tell me, how this  
relates to TimBL's notes [1] [2] (if it does)?


I'm especially interested in the following:


 + How exactly is SPARQL utilised in your proposal? See also [3] and  
[4] for related work.
 + How is authentication and authorisation handled (like WebID [5]  
and WAC [6])?


Cheers,
Michael
[1] http://www.w3.org/DesignIssues/ReadWriteLinkedData.html
[2] http://www.w3.org/DesignIssues/CloudStorage.html
[3] http://www.w3.org/TR/sparql11-http-rdf-update/
[4] http://portal.acm.org/citation.cfm?id=1645412
[5] http://www.w3.org/2005/Incubator/webid/spec/
[6] http://www.w3.org/wiki/WebAccessControl
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 5 May 2011, at 09:12, Sebastian Schaffert wrote:


Dear all,

in the context of our work in Salzburg NewMediaLab and the KiWi EU  
project before, we had an idea that I would like to get feedback  
from the Linked Data Community. We are also writing on an article  
about it (probably for ISWC), but I think it makes sense to discuss  
the idea in advance. Maybe there is also a bit of related work that  
we are not yet aware of.


Salzburg NewMediaLab is a close-to-industry research project in the  
media/broadcasting and the enterprise knowledge management domain.  
Goal of the current phase is to connect enterprise archives  
(multimedia but also other) with Linked (Open) Data sources to  
provide added value. In this context, it is not only relevant to  
publish and consume Linked Data, we also had the requirements to be  
able to easily update Linked Data and also to manage content and  
metadata in a uniform way. We therefore call our extension Linked  
Media, and I am going to briefly describe it in a rather informal  
way.


Background
--

The idea is a kind of combination of concepts from Linked Data,  
Media Management and Enterprise Knowledge Management (from KiWi). Up  
till now, the Linked Data world is read-only and primarily concerned  
with the structured data associated with a resource (regardless of  
whether this data is represented in RDF or visualised in HTML).  
However, in order to build more interactive mashups, it would make  
sense to also allow updates to the data in Linked Data servers. And  
in enterprise settings, it makes sense to have a unified means to  
manage both structured data and human-readable content for a  
resource. For example, a resource might represent a video on the  
internet, and depending on how I access the video I want to get  
either the video itself or the structured metadata about the video  
(e.g. a list of RDF links to DBPedia for all persons depicted in the  
video).


Our Linked Media idea tries to address both issues:
- it extends the Linked Data principles with RESTful principles for  
addition, modification, and deletion of resources
- it extends the Linked Data principles by means to manage content  
and meta-data alike using MIME to URL mapping



Linked Media Idea
-

1. extending the Linked Data principles for updates using REST

Linked Data is currently read-only and depending on Accept headers  
in the HTTP request, it redirects a request to the appropriate  
representation (RDF or HTML). For supporting updates in Linked Data,  
a consequent extension of Linked Data is to apply REST and otherwise  
use the same or analgous principles. This means that GET is used to  
retrieve a resource, POST is used to create a resource, PUT is used  
to update a resource, and DELETE is used to remove a resource. In  
case of GET, the Accept header determines what to retrieve and  
redirects to the appropriate URL; in case of PUT, the Content-Type  
header determines what to update and also redirects to the  
appropriate URL. This extension is therefore fully backwards  
compatible to Linked Data, i.e. each Linked Media server is a Linked  
Data server.


2. extending the Linked Data principles for arbitrary content using  
MIME mapping and rel Content Type


Linked Data currently distinguishes between an RDF representation  
and a human readable representation in the GET request. The GET  
request then redirects either to the URL of the RDF representation  
or to the URL of the human readable (HTML) representation. We  
extended this principle so that it can handle arbitrary formats  
based on the MIME type in Accept/Content-Type headers and so that it  
can still distinguish between content and metadata based on the  
rel extension for Accept/Content-Type headers.


The basic idea is to rewrite resource URLs of the form http://localhost/resource/1234 
 depending on the MIME type as follows:
- if the Accept/Content-Type header is of the form Accept: type/ 
subtype; rel=content, then the redirect URL

Re: Minting URIs: how to deal with unknown data structures

2011-04-15 Thread Michael Hausenblas

Frans,

Great to hear that you're interested in applying Linked Data and to
promote it in the Netherlands - certainly a very active area ;)

I would welcome any advice on this topic from people who have had
some more experience with publishing Linked Data.

I find [1] a very useful page from a pragmatic perspective. If you're
more into books and not only focusing on the data side (see 'REST and
Linked Data: a match made for domain driven development?' [2] for more
details on data vs. API), I can also recommend [3], which offers some
more practical guidance in terms of URI space management.

Cheers,
Michael

[1] http://data.gov.uk/resources/uris
[2] http://ws-rest.org/2011/proc/a5-page.pdf
[3] http://oreilly.com/catalog/9780596529260
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 15 Apr 2011, at 13:48, Frans Knibbe wrote:

Hello,

Some newbie questions here...

I have recently come in contact with the concept of Linked Data and
I have become enthusiastic. I would like to promote the idea within
my company (we specialize is geographical data) and within my
country. I have read the excellent Linked Data book (“Linked Data:
Evolving the Web into a Global Data Space”) and I think I am almost
ready to start publishing Linked Data. I understand that it is
important to get the URIs right, and not have to change them later.
That is what my questions are about.

I have acquired the first part (authority) of my URIs, let's say it
is lod.mycompany.com. Now I am faced with the question: How do I
come up with a URI scheme that will stand the test of time? I think
I will start with publishing some FOAF data of myself and co-
workers. And then hopefully more and more data will follow. At this
moment I can not possible imagine which types of data we will
publish. They are likely to have some kind of geographical
component, but that is true for a lot of data. I believe it is not
possible to come up with any hierarchical structure that will
accommodate all types of data that might ever be published.

So I think it is best to leave out any indication of data
organization in the path element of the URI (i.e. http://lod.mycompany.com/people
is a bad idea). In my understanding, I could use base URIs like http://lod.mycompany.com/resource
, http://lod.mycompany.com/page and hhtp://lod.mycompany.com.data,
and then use unique identifiers for all the things I want to publish
something about. If I understand correctly, I don't need the URI to
describe the hierarchy of my data because all Linked Data are self-
describing. Nice.

But then I am faced with the problem: What method do I use to mint
my identifiers? Those identifiers need to be unique. Should I use a
number sequence, or a hash function? In those cases the URIs would
be uniform and give no indication of the type of data. But a number
sequence seems unsafe, and in the case of a hash function I would
still need to make some kind of structured choice of input values.

I would welcome any advice on this topic from people who have had
some more experience with publishing Linked Data.

Regards,
Frans Knibbe

Re: Exciting changes at Data.Southampton.ac.uk!

2011-04-01 Thread Michael Hausenblas



After some heated debate after the backlash against me for my recent  
comments about PDF, I've been forced to shift to recommending PDF as  
the preferred format for the data.southampton.ac.uk site, both for  
publishing and importing data.



If today wasn't April Fool's Day I would have been worried. Nice one,  
Chris.



Cheers,
Michael
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 1 Apr 2011, at 08:23, Christopher Gutteridge wrote:

After some heated debate after the backlash against me for my recent  
comments about PDF, I've been forced to shift to recommending PDF as  
the preferred format for the data.southampton.ac.uk site, both for  
publishing and importing data.


There are some issues with this and I know not every one will be  
happy with the decision; it wasn't easy to make... but on  
reflection, however, it's the right one. It is much easier for non  
programmers (the majority of people) to work with PDF documents and  
they are supported by pretty much every platform you can think of  
with a choice of tools and the benefit of familiarity.


We've provided a wrapper around 4store to make PDF the default  
output mode:
http://sparql.data.southampton.ac.uk/?query=PREFIX+soton%3A+%3Chttp%3A%2F%2Fid.southampton.ac.uk%2Fns%2F%3E%0D%0APREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0APREFIX+skos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%23%3E%0D%0APREFIX+geo%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E%0D%0APREFIX+rdfs%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E%0D%0APREFIX+org%3A+%3Chttp%3A%2F%2Fwww.w3.org%2Fns%2Forg%23%3E%0D%0APREFIX+spacerel%3A+%3Chttp%3A%2F%2Fdata.ordnancesurvey.co.uk%2Fontology%2Fspatialrelations%2F%3E%0D%0APREFIX+ep%3A+%3Chttp%3A%2F%2Feprints.org%2Fontology%2F%3E%0D%0APREFIX+dct%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%3E%0D%0APREFIX+bibo%3A+%3Chttp%3A%2F%2Fpurl.org%2Fontology%2Fbibo%2F%3E%0D%0APREFIX+owl%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2002%2F07%2Fowl%23%3E%0D%0A%0D%0ASELECT+%3Fs+WHERE+ 
{%0D%0A%3Fs+%3Fp+%3Fo+.%0D%0A}+LIMIT 
+10output=pdfjsonp=#results_table


And most information URIs can now be resolved to PDF, but we are  
sticking to HTML as the default (for now)

http://data.southampton.ac.uk/products-and-services/FreshFruit.pdf

The full details and rationale are on our data blog
http://blogs.ecs.soton.ac.uk/data/2011/04/01/pdf-selected-as-interchange-format/E

--
Christopher Gutteridge -- http://id.ecs.soton.ac.uk/person/1248

You should read the ECS Web Team blog: http://blogs.ecs.soton.ac.uk/webteam/

LOD community gathering at WWW2011

2011-03-17 Thread Michael Hausenblas



All,

As part of the WWW2011, we'd like to invite you to join the Linked  
Open Data gathering [1] on Tue 29 March, after the LDOW workshop [2].  
The exact time and location has yet to be determined. If you plan to  
attend, please leave your name at the Wiki page [1] (or if you don't  
have an account, let me know so I can put it there). Suggestions for  
the venue are welcome.


The LOD gatherings have a rather long tradition (this is the 18th  
gathering since 2007) and are well-known to be both socially and  
content-wise very attractive.

Cheers,
Michael

[1] 
http://www.w3.org/wiki/SweoIG/TaskForces/CommunityProjects/LinkingOpenData/HyderabadGathering
[2] http://events.linkeddata.org/ldow2011/
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: The truth about SPARQL Endpoint availability

2011-03-05 Thread Michael Hausenblas



I'm no SPARQL or voiD guru, but I think you need a bit more wrapping  
in the scovo stuff, so more like:

ROTFL, reading that Hugh claims to be *not* a VoID guru ;)
Note that SCOVO modelling of stats in VoID has been deprecated and  
simplified [1].



Fancy the challenge, it is the weekend?! :-)


Indeed!

Cheers,
Michael
[1] http://www.w3.org/TR/void/#statistics
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 5 Mar 2011, at 15:14, Hugh Glaser wrote:


Hi,
On 5 Mar 2011, at 14:22, Andrea Splendiani wrote:


Hi,

I think it depends on the store, I've tried some (from the endpoint  
list) and some returns a answer pretty quickly. Some doesn't and  
some doesn't support count.
However, one could have this information only for the stores that  
answers the count query, no need to try all time.
I am happy for a store implementor or owner to disagree, but I find  
it very unlikely that the owner of a store with a decent chunk of  
data ( 1M triples, say) would be happy for someone to keep issuing  
such a query, even if they did decide to give enough resources to  
execute it.

I would quickly blacklist such a site.


VoID:
is this a good query:
select * where {?s http://rdfs.org/ns/void#numberOfTriples ?o }


I'm no SPARQL or voiD guru, but I think you need a bit more wrapping  
in the scovo stuff, so more like:


SELECT DISTINCT ?endpoint ?uri ?triples ?uris WHERE
  { ?ds a void:Dataset .
?ds void:sparqlEndpoint ?uri .
?ds rdfs:label ?endpoint .
?ds void:statItem [ scovo:dimension  
void:numberOfTriples ; rdf:value  ?triples ] .

 }

Try it at
http://kwijibo.talis.com/voiD/
or
http://void.rkbexplorer.com/

I guess Pierre-Yves might like to enhance his page by querying a  
voiD store to also give basic stats.
Or someone might like to do a store reporter that uses (a) voiD  
endpoint(s) plus Pierre-Yves's data (he has a SPARQL endpoint), to  
do so.

And maybe the CKAN endpoint would have extra useful data as well.
A real Semantic Web application that queried more than one SPARQL  
endpoint - now that would be a novelty!

Fancy the challenge, it is the weekend?! :-)

ciao
Hugh



it doesn't seem viable if so.

ciao,
Andrea


Il giorno 05/mar/2011, alle ore 13.49, Hugh Glaser ha scritto:


NIce idea, but,... :-)

SELECT (count(*) as ?c) WHERE {?s ?p ?o}

is a pretty anti-social thing to do to a store.
At best, a store of any size will spend a while thinking, and then  
quite rightly decide they have burnt enough resources, and return  
some sort of error.


For a properly maintained site, of course, the VoiD description  
will give lots of similar information.

Best
Hugh

On 5 Mar 2011, at 13:06, Andrea Splendiani wrote:


Hi, very nice!
I have a small suggestion:

why don't you ask count(*) where {?s ?p ?o} to the endpoint ?
Or ask for the number of graphs ?
Both information, number of triples and number of graphs, if  
logged and compared over time, can give a practical view of the  
liveliness of the content of the endpoint.


best,
Andrea Splendiani


Il giorno 28/feb/2011, alle ore 18.55, Pierre-Yves Vandenbussche  
ha scritto:



Hello all,

you have already encountered problems of SPARQL endpoint  
accessibility ?

you feel frustrated they are never available when you need them?
you develop an application using these services but wonder if it  
is reliable?


Here is a tool [1] that allows you to know public SPARQL  
endpoints availability and monitor them in the last hours/days.
Stay informed of a particular (or all) endpoint status changes  
through RSS feeds.
All availability information generated by this tool is  
accessible through a SPARQL endpoint.


This tool fetches public SPARQL endpoints from CKAN  open data.  
From this list, it runs tests every hour for availability.


[1] http://labs.mondeca.com/sparqlEndpointsStatus/index.html
[2] http://ckan.net/

Pierre-Yves Vandenbussche.


Andrea Splendiani
Senior Bioinformatics Scientist
Centre for Mathematical and Computational Biology
+44(0)1582 763133 ext 2004
andrea.splendi...@bbsrc.ac.uk





--
Hugh Glaser,
   Intelligence, Agents, Multimedia
   School of Electronics and Computer Science,
   University of Southampton,
   Southampton SO17 1BJ
Work: +44 23 8059 3670, Fax: +44 23 8059 3045
Mobile: +44 78 9422 3822, Home: +44 23 8061 5652
http://www.ecs.soton.ac.uk/~hg/




Andrea Splendiani
Senior Bioinformatics Scientist
Centre for Mathematical and Computational Biology
+44(0)1582 763133 ext 2004
andrea.splendi...@bbsrc.ac.uk





--
Hugh Glaser,
 Intelligence, Agents, Multimedia
 School of Electronics and Computer Science,
 University of Southampton,
 Southampton SO17 1BJ
Work: +44 23 8059

Re: The truth about SPARQL Endpoint availability

2011-02-28 Thread Michael Hausenblas



Pierre-Yves,

Great contribution to the eco-system, congrats! Where applicable and  
if possible you may want to consider using the SD vocab as described  
in [1].


KUGTW!
Cheers,
Michael
[1] http://www.w3.org/2001/sw/interest/void/#sparql-sd
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 28 Feb 2011, at 23:03, Pierre-Yves Vandenbussche wrote:


Kingsley,

Thanks for your support. All data available through the SPARQL  
endpoint is compliant to this vocabulary: http://labs.mondeca.com/vocab/endpointStatus 
 which relies on VoID . What Robert suggested me is to integrate  
RDFa in RSS feed which is a great idea.


I will for sure improve the endpoint accessibility for humans.

Pierre-Yves Vandenbussche
Research  Development
Mondeca
3, cité Nollez 75018 Paris France
Tel. +33 (0)1 44 92 35 07 - fax +33 (0)1 44 92 02 59
Mail: pierre-yves.vandenbuss...@mondeca.com
Website: www.mondeca.com
Blog: Leçons de choses


On Mon, Feb 28, 2011 at 11:54 PM, Kingsley Idehen kide...@openlinksw.com 
 wrote:

On 2/28/11 5:43 PM, Pierre-Yves Vandenbussche wrote:


Robert,

Do you have example of inline Semantic Web Linked Data in the  
feeds ?


My SPARQL endpoint have no human client for the moment ... computer  
first !!


Do you have a graph representation of the data describing SPARQL  
endpoint availability using term from the vocabulary you devised for  
this effort?


Basically, do you have HTML+RDFa, RDF/XML, N-Triples, Turtle etc..  
representations of your entity descriptions graphs? You could place  
SPARQL protocol URLs in link/ within head/ as we do re. DBpedia  
pages, for instance.


Kingsley




Pierre-Yves Vandenbussche
Research  Development
Mondeca
3, cité Nollez 75018 Paris France
Tel. +33 (0)1 44 92 35 07 - fax +33 (0)1 44 92 02 59
Mail: pierre-yves.vandenbuss...@mondeca.com
Website: www.mondeca.com
Blog: Leçons de choses


On Mon, Feb 28, 2011 at 11:35 PM, Bob Ferris z...@elbklang.net  
wrote:

Oh sorry,

I overlooked this for some reason. What a pitty. However, I thought  
more about some inline Semantic Web Linked Data in the feeds. Would  
that be an option?


Cheers,


Bob


PS: http://labs.mondeca.com/repositories/ENDPOINT_STATUS delivers  
me a Missing parameter: query. So I guess, I have to parametrize  
the request. An instruction for that might be useful then ;)



Am 28.02.2011 23:25, schrieb Pierre-Yves Vandenbussche:
Hello Robert,

Every information produced by this service are stored in a SPARQL
Endpoint :
http://labs.mondeca.com/sparqlEndpointsStatus/endpoint/endpoint.html
These open data are linked to CKAN ones. You can already access them.

best,

Pierre-Yves Vandenbussche
Research  Development
Mondeca
3, cité Nollez 75018 Paris France
Tel. +33 (0)1 44 92 35 07 - fax +33 (0)1 44 92 02 59
Mail: pierre-yves.vandenbuss...@mondeca.com
mailto:pierre-yves.vandenbuss...@mondeca.com
Website: www.mondeca.com http://www.mondeca.com/
Blog: Leçons de choses http://mondeca.wordpress.com/



On Mon, Feb 28, 2011 at 10:45 PM, Bob Ferris z...@elbklang.net
mailto:z...@elbklang.net wrote:

   Congrats Pierre, well done!

   This might hopefully become a quite useful resource. Any plans to
   publish this information itself as Semantic Web Linked Data?

   Cheers,


   Bob

   Am 28.02.2011 19:55, schrieb Pierre-Yves Vandenbussche:

   Hello all,

   you have already encountered problems of SPARQL endpoint
   accessibility ?
   you feel frustrated they are never available when you need  
them?
   you develop an application using these services but wonder  
if it is

   reliable?

   Here is a tool
   http://labs.mondeca.com/sparqlEndpointsStatus/index.html[1]

   that allows you to know public SPARQL endpoints availability
   and monitor them in the last hours/days.
   Stay informed of a particular (or all) endpoint status changes
   through RSS feeds.
   All availability information generated by this tool is
   accessible through a SPARQL
   endpoint.

   This tool fetches public SPARQL endpoints from CKAN
   http://ckan.net/ open data.

From this list, it runs tests every hour for availability.

   [1] http://labs.mondeca.com/sparqlEndpointsStatus/index.html
   http://labs.mondeca.com/sparqlEndpointsStatus/index.html[2]
   http://ckan.net/

   Pierre-Yves Vandenbussche.





--

Regards,

Kingsley Idehen 
President  CEO
OpenLink Software
Web: http://www.openlinksw.com

Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen

Re: CORS question (was Re: Proposal to assess the quality of Linked Data sources)

2011-02-25 Thread Michael Hausenblas





I tried this recently and it didn't work on either Safari or Chrome
(iirc) without adding:

   Access-Control-Allow-Methods: GET

Has anyone else had this issue?



Hmmm. Unsure, but at least the script I wrote for [1] doesn't seem to  
require it and I *think* works fine. Would be glad to learn if this is  
not the case and adapt it respectively.

Cheers,
Michael

[1] http://enable-cors.org/#check
--
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

On 25 Feb 2011, at 12:22, Damian Steer wrote:


-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Sorry for changing the topic (and, indeed, sailing off list topic).

On 24/02/11 18:28, Melvin Carvalho wrote:



http://www.w3.org/wiki/CORS_Enabled

[reproduced for convenience] ...




To give Javascript clients basic access to your resources requires
adding one HTTP Response Header, namely:

Access-Control-Allow-Origin: *



I tried this recently and it didn't work on either Safari or Chrome
(iirc) without adding:

   Access-Control-Allow-Methods: GET

Has anyone else had this issue?

Damian
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAk1nkNcACgkQAyLCB+mTtynQ4QCfWNSN8IshBfr6ot6XqiO3dxGj
g9UAoLuVH34Pr0aiIyl5HT3RP+Fvo0dZ
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3rd and last CfP: Linked Data on the Web (LDOW2011) Workshop at WWW2011

2011-02-07 Thread Michael Hausenblas

All,

Due to multiple requests, we have decided to extend the submission deadline
of the 4th International Workshop on Linked Data on the Web (LDOW2011) at
WWW2011, to:

  Submission deadline: Sunday 13th February, 2011, 23:59 CET

Note that this is a hard deadline, no further extensions will be made. The
full CfP is available via the LDOW2011 website:

  http://events.linkeddata.org/ldow2011/

We are looking forward to see you at LDOW2011 in Hyderabad, India.

Cheers,
Chris Bizer
Tom Heath
Tim Berners-Lee
Michael Hausenblas

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: How to declare in a web app's interface which kind of app/version/features and or interfaces or formats it exposes

2011-01-20 Thread Michael Hausenblas


Olivier,

 I'm considering the different options that could help embed (with
 slightest modifications possible) in the in HTML interface of a Web app,
 a description of which app it is and/or which interfaces it exposes, so
 that this would be discoverable and lead to exploitation of such data
 by SemWeb apps, or existing harvesters.

You might find my blog post 'Announcing Application Metadata on the Web
of Data' [1] along with the template [2] useful for this purpose.

Cheers,
  Michael

[1] 
http://webofdata.wordpress.com/2010/01/06/announcing-application-metadata
[2] http://lab.linkeddata.deri.ie/2010/res/web-app-metadata-template.html

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Olivier Berger olivier.ber...@it-sudparis.eu
 Date: Thu, 20 Jan 2011 16:42:16 +0100
 To: Linked Data community public-lod@w3.org
 Subject: How to declare in a web app's interface which kind of
 app/version/features and or interfaces or formats it exposes
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 20 Jan 2011 15:43:59 +
 
 Hi.
 
 I'm considering the different options that could help embed (with
 slightest modifications possible) in the in HTML interface of a Web app,
 a description of which app it is and/or which interfaces it exposes, so
 that this would be discoverable and lead to exploitation of such data
 by SemWeb apps, or existing harvesters.
 
 Which SemWeb standards could be used to do so ?
 
 Thanks in advance.
 
 Best regards,
 -- 
 Olivier BERGER olivier.ber...@it-sudparis.eu
 http://www-public.it-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
 Ingénieur Recherche - Dept INF
 Institut TELECOM, SudParis (http://www.it-sudparis.eu/), Evry (France)

Re: Linked Open Data star badges

2010-12-11 Thread Michael Hausenblas


1. Let's try to avoid cross-posting if not necessary. This discussion is
already ongoing in CKAN discuss [1].

2. Antoine, you and others (incl. dataset publishers) are free to use it -
or ignore it. If you want to see it happen at [2], then I'd suggest you just
go there and implement it.

3. The badges, just as TimBL's original star scheme, are a marketing
vehicle. Something, CTOs, Web developers, content owners such as government
agencies, etc. should be able to comprehend rather easily. Let's not try to
make a science out of it.

/me back to some work with concrete output and potential impact ;)

Cheers,
  Michael

[1] http://lists.okfn.org/pipermail/ckan-discuss/2010-December/000819.html
[2] http://esw.w3.org/DataSetRDFDumps

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Pablo Mendes pablomen...@gmail.com
 Date: Sat, 11 Dec 2010 10:20:00 +0100
 To: Antoine Zimmermann antoine.zimmerm...@insa-lyon.fr,
 ckan-disc...@lists.okfn.org
 Cc: Michael Hausenblas michael.hausenb...@deri.org, Linked Data community
 public-lod@w3.org
 Subject: Re: Linked Open Data star badges
 
 Maybe there is a potential of interaction between CKAN Curation Tool and the
 LOD badges?
 
 a tool that looks at
 http://packages.python.org/curate/overview.html packages
 on CKAN, applies some rules, and produces some output.
 Thehttp://packages.python.org/curate/overview.html
 output might be instructions to add a tag to a package or it might be
 to add a package to a group.http://packages.python.org/curate/overview.html
 http://packages.python.org/curate/overview.html
 
 The LOD badges are based on
 TimBL's 5-star data scheme
 http://lab.linkeddata.deri.ie/2010/lod-badges/
 
 Cheers,
 Pablo
 
 http://packages.python.org/curate/overview.html
 On Fri, Dec 10, 2010 at 4:23 PM, Antoine Zimmermann 
 antoine.zimmerm...@insa-lyon.fr wrote:
 
 Michael,
 
 
 Good job, I like the look of these badges.
 However, I'm wondering: will the people who have a 0 or 1-star dataset put
 a badge on their Web page? It's like putting a badge saying HTML page
 /almost/ valid: 3 errors only!
 In the end, I guess only the 5 star badge will be proudly displayed by
 dataset owners.
 Still, I think those badges have a utility, but not for the dataset owners.
 I can imagine a web page listing existing, independent datasets (such as
 [1]) where each row has the corresponding badge. This way, one can
 immediately and visually determine the level of interoperability of the
 dataset.
 
 
 [1] http://esw.w3.org/DataSetRDFDumps
 
 
 Cheers,
 AZ.
 
 Le 07/12/2010 11:09, Michael Hausenblas a écrit :
 
 
 If you want to express your support for LOD data on your dataset Web page,
 you can now use the LOD badges [1] to do so. The LOD badges are based on
 TimBL's 5-star data scheme, which has been made available via [2].
 
 Cheers,
   Michael
 
 [1] http://lab.linkeddata.deri.ie/2010/lod-badges/
 [2] http://www.w3.org/DesignIssues/LinkedData.html
 
 
 
 --
 Antoine Zimmermann
 Researcher at:
 Laboratoire d'InfoRmatique en Image et Systèmes d'information
 Database Group
 7 Avenue Jean Capelle
 69621 Villeurbanne Cedex
 France
 Lecturer at:
 Institut National des Sciences Appliquées de Lyon
 20 Avenue Albert Einstein
 69621 Villeurbanne Cedex
 France
 antoine.zimmerm...@insa-lyon.fr
 http://zimmer.aprilfoolsreview.com/

Linked Open Data star badges

2010-12-07 Thread Michael Hausenblas


If you want to express your support for LOD data on your dataset Web page,
you can now use the LOD badges [1] to do so. The LOD badges are based on
TimBL's 5-star data scheme, which has been made available via [2].

Cheers,
  Michael

[1] http://lab.linkeddata.deri.ie/2010/lod-badges/
[2] http://www.w3.org/DesignIssues/LinkedData.html

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: linked data about the W3C?

2010-11-24 Thread Michael Hausenblas

Pierre-Antoine Champin,

You mean something like [1]?
 
Cheers,
  Michael

[1] http://www.w3.org/2002/01/tr-automation/tr.rdf

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Pierre-Antoine Champin swlists-040...@champin.net
 Date: Wed, 24 Nov 2010 12:40:33 +0100
 To: Linked Data community public-lod@w3.org
 Subject: linked data about the W3C?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Wed, 24 Nov 2010 11:42:38 +
 
 Hi,
 
 is there any linked data published about the W3C?
 Semantic Radar does not see any on their webpages.
 
 It is a shame, because I would like to get some statistics about the
 members, and I'm condemned to manually go through the 324 links of [1].
 
 Talking about eating one's own dog food :-P
 
pa
 
 [1] http://www.w3.org/Consortium/Member/List

Re: Is 303 really necessary?


Ian,

(trying to keep up with this thread, maybe missed one point or the other)

I'd like to understand on what we can agree here. It seems that having a URI
for a thing and another URI for the document describing it is something most
people would acknowledge to be useful.

Two questions that come immediately into mind: Who cares? What are the costs
and what are the benefits?

First, I'd reckon that a certain number of tools and library developers
(incl. Tabulator, RAP, RDB2RDF mapping tools, etc.) will have to care about
this in the first place. Given the relative small size of the community
compared to the Web at large this seems doable.

Second, as already pointed out, the 303 issue mainly effects setups where
the RDF representation is detached from the HTML (such as RDF/XML, Turtle,
etc.), which means that the emerging and increasing part of the RDFa-based
Linked Data world is not effected per se.

Third, given that we're still a small community and find certain things to
be sub-optimal, the cost changing it now is likely less than changing it in,
say, 5 years time.

I think I can hence sympathise with your proposal to (carefully) revisit the
issue and think about alternatives. Now, having said this, although I think
one should contemplate about the 303 issue, I don't agree with your proposed
plan ahead; certain items on your list are rather simple to achieve (define
the :isDescribedBy, update the LD guide, etc.) others not.

It occurs to me that one of the main features of the Linked Data community
is that we *do* things rather than having endless conversations what would
be the best for the world out there. Heck, this is how the whole thing
started. A couple of people defining a set of good practices and providing
data following these practices and tools for it.

Concluding. If you are serious about this, please go ahead. You have a very
popular and powerful platform at your hand. Implement it there (and in your
libraries, such as Moriarty), document it, and others may/will follow.


Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Ian Davis m...@iandavis.com
 Date: Thu, 4 Nov 2010 13:22:09 +
 To: Linked Data community public-lod@w3.org
 Subject: Is 303 really necessary?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 04 Nov 2010 13:22:46 +
 
 Hi all,
 
 The subject of this email is the title of a blog post I wrote last
 night questioning whether we actually need to continue with the 303
 redirect approach for Linked Data. My suggestion is that replacing it
 with a 200 is in practice harmless and that nothing actually breaks on
 the web. Please take a moment to read it if you are interested.
 
 http://iand.posterous.com/is-303-really-necessary
 
 Cheers,
 
 Ian

[Request for Input] Linked Data Specifications


All,

There are quite some specs beyond the core specs (HTTP, URIs, RDF) that are
relevant to Linked Data. In order to document this, we've set up a Web page
[1] collecting these specs. The page is primarily targeting Linked Data
newbies but should, IMHO, also be able to offer some gems for advanced
Linked Data folks.

I'd appreciate suggestions via the ESW Wiki page [2] and hope that this is
useful for the community.

Cheers,
  Michael

[1] http://linkeddata-specs.info/
[2] 
http://esw.w3.org/SweoIG/TaskForces/CommunityProjects/LinkingOpenData/Specif
ications

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: [Request for Input] Linked Data Specifications

Dave,

 A good idea.

Thanks.

 Could I request you more clearly separate the formal specifications from
 the de facto community practice documents. The Change Set vocabulary, to
 pick one example, doesn't really have the same standing, adoption or
 level of scrutiny as the RFCs, does it?

Good proposal, indeed. I plan to add a short statement to each spec anyway
to explain how it contributes to a core spec, and in doing so, will add this
(crucial) bit of information as well. Thanks!

Cheers,
  Michael

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Dave Reynolds dave.e.reyno...@gmail.com
 Date: Fri, 05 Nov 2010 11:31:46 +
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: Linked Data community public-lod@w3.org
 Subject: Re: [Request for Input] Linked Data Specifications
 
 Hi Michael,
 
 A good idea.
 
 Could I request you more clearly separate the formal specifications from
 the de facto community practice documents. The Change Set vocabulary, to
 pick one example, doesn't really have the same standing, adoption or
 level of scrutiny as the RFCs, does it?
 
 Dave
 
 On Fri, 2010-11-05 at 10:33 +, Michael Hausenblas wrote:
 All,
 
 There are quite some specs beyond the core specs (HTTP, URIs, RDF) that are
 relevant to Linked Data. In order to document this, we've set up a Web page
 [1] collecting these specs. The page is primarily targeting Linked Data
 newbies but should, IMHO, also be able to offer some gems for advanced
 Linked Data folks.
 
 I'd appreciate suggestions via the ESW Wiki page [2] and hope that this is
 useful for the community.
 
 Cheers,
   Michael
 
 [1] http://linkeddata-specs.info/
 [2] 
 http://esw.w3.org/SweoIG/TaskForces/CommunityProjects/LinkingOpenData/Specif
 ications

Re: [Request for Input] Linked Data Specifications


Nathan,

Thanks for your feedback!

 Michael, also worth mentioning RDFa, Turtle, N3?

Hmmm. Not sure, as I was hoping to avoid duplication to a certain extend, as
I think the SWAP publications page does an excellent job already. But maybe
the most important ones in the supplementary/serialisation section?

 can you bold the link to the SWAP publications / highlight in some way,
 as it's a pretty important one.

Yes.

 Perhaps more vocabs, perhaps sioc, org, dct, foaf and a pointer to a
 good resource for vocabs.

Uh uh. I don't wanna get into domain semantics or pretend I can give an
exhaustive overview of the vocabularies, there, really. Hope you understand
;)


Cheers,
  Michael

-- 
Dr. Michael Hausenblas, Research Fellow
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Fri, 05 Nov 2010 12:00:10 +
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: Dave Reynolds dave.e.reyno...@gmail.com, Linked Data community
 public-lod@w3.org
 Subject: Re: [Request for Input] Linked Data Specifications
 
 Dave Reynolds wrote:
 Hi Michael,
 
 A good idea.
 
 My sentiments exactly :)
 
 Michael, also worth mentioning RDFa, Turtle, N3?
 
 and also any note on IRI or HTTP-bis?
 
 can you bold the link to the SWAP publications / highlight in some way,
 as it's a pretty important one.
 
 Perhaps more vocabs, perhaps sioc, org, dct, foaf and a pointer to a
 good resource for vocabs.
 
 Could I request you more clearly separate the formal specifications from
 the de facto community practice documents. The Change Set vocabulary, to
 pick one example, doesn't really have the same standing, adoption or
 level of scrutiny as the RFCs, does it?
 
 and +1 to the above (re make them clearly distinct, not say CS is of the
 same standing as web standards!).
 
 Best,
 
 Nathan

Re: R2RML: RDB to RDF Mapping Language

2010-10-31 Thread Michael Hausenblas


Riccardo,

D2R is one way to do it, a sort of non-standardised precursor to R2RML.
There are many more ways to do it [1] - that's why we standardise it ;)

Cheers,
  Michael (with his RDB2RDF WG co-chair hat on)

[1] http://www.w3.org/2005/Incubator/rdb2rdf/RDB2RDF_SurveyReport.pdf

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Riccardo Tasso ta...@elet.polimi.it
 Date: Sun, 31 Oct 2010 12:00:56 +0100
 To: Ivan Herman i...@ivan-herman.net
 Cc: Linked Data community public-lod@w3.org, Semantic Web community
 semantic-...@w3.org
 Subject: Re: R2RML: RDB to RDF Mapping Language
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Sun, 31 Oct 2010 11:01:48 +
 
 What is the difference with D2R [1]?
 
 Riccardo
 
 [1] http://www4.wiwiss.fu-berlin.de/bizer/d2rmap/D2Rmap.htm
 
 On 31/10/2010 10:13, Ivan Herman wrote:
 FYI...
 
 The RDB2RDF Working Group[1] has published the First Public Working Draft of
 R2RML: RDB to RDF Mapping Language[2]. R2RML is a language for describing how
 to put relational data on the Semantic Web. With R2RML, people express
 customized mappings from relational databases to RDF datasets, allowing them
 to view existing relational data in the RDF data model, expressed in their
 preferred structure and target vocabulary.
 
 
 Ivan
 
 [1] http://www.w3.org/2001/sw/rdb2rdf/
 [2] http://www.w3.org/TR/2010/WD-r2rml-20101028/
 
 
 Ivan Herman
 Bankrashof 108
 1183NW Amstelveen
 The Netherlands
 http://www.ivan-herman.net

Re: AW: ANN: LOD Cloud - Statistics and compliance with best practices

2010-10-21 Thread Michael Hausenblas


(cutting down lists as cross-posting is against W3C list policy)

I'm in general with Chris. Of course RDFa is/can be used to do Linked Data.
But rather than wasting our time in ranting how bad the world is, how about
just making it a better place?

1. Clearly, we need to motivate why interlinking is  beneficial or at least
offer 3rd party services that do the job for the publishers (if they don't
see the benefit or have other priorities).

2. Again, rather than discussing endlessly about what is fair and what is
not and who should be there and who not and so on ... hey, it's the Web. An
open, free ecosystem where you can just put up your own visualisation,
diagram, stats, etc. - tthe community will then decide how valuable and
useful it is.

/me back to work now; trying to help solve the issues rather than talking
about it in the first place ;)

Correcting one factual error in Gio's post, though:

 So danny ayers has fun linking to dbpedia so he is in there with his
 joke dataset, but you cant credibly bring that argument to large
 retailers so they're left out?

Denny Vrandecic.

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Giovanni Tummarello giovanni.tummare...@deri.org
 Date: Thu, 21 Oct 2010 13:12:10 +0100
 To: Chris Bizer ch...@bizer.de
 Cc: Martin Hepp martin.h...@ebusiness-unibw.org, Thomas Steiner
 tstei...@google.com, Semantic Web community semantic-...@w3.org, Linked
 Data community public-lod@w3.org, Anja Jentzsch a...@anjeve.de,
 semanticweb semantic...@yahoogroups.com, Kingsley Idehen
 kide...@openlinksw.com
 Subject: Re: AW: ANN: LOD Cloud - Statistics and compliance with best
 practices
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 21 Oct 2010 12:12:41 +
 
 But again: I agree that crawling the Web of Data and then deriving a dataset
 catalog as well as meta-data about the datasets directly from the crawled
 data would be clearly preferable and would also scale way better.
 
 Thus: Could please somebody start a crawler and build such a catalog?
 
 As long as nobody does this, I will keep on using CKAN.
 
 
 Hi Chris, all
 
 I can only restate that within Sindice we're very open to anyone who
 wanted to develop data anlisys apps creating catalogs automatically.
 At the moment a map reduce job a couple of week ago gave an excess of
 100k independent datasets. How many interlinked etc? to be analyzed.
 
 Our interest (and the interest of the Semantic Web vision i want to
 sposor) is to make sure RDFa sites are fully included and so are those
 who provide markup which can however be translated in an
 automatic/agreeable way (so no scraping or sponging) into RDF. (that
 is anything that any23.org can turn into triples)
 
 If you were indeed interested in running your or developing your
 algorithms in our running dataset no problem, the code can be made
 opensource so it would run on others similarly structured datasets.
 
 This said yes i think too that in this phase a CKAN like repository
 can be an interesting aggregation point, why not.
 
  But i do think the diagram, which made great sense as an example when
 Richard started it is now at risk of providing a disservice
 which is in line which what Martin is making noticed.
 
 The diagram as it is now kinda implicitly conveys the sense that if
 something is so large then all that matters must be there and that's
 absolutely not the case.
 
 a) there are plenty of extremely useful datasets is RDF/RDFa etc which
 are not there
 b) the usefulness of being linked is all but a proven fact, so on the
 one hand people might want to be there on the other you'd have to do
 pushing toward serious commercial entities (for example) to link to
 dbpedia for reasons that arent clear and that hurts your credibility.
 
 So danny ayers has fun linking to dbpedia so he is in there with his
 joke dataset, but you cant credibly bring that argument to large
 retailers so they're left out?
 
 this would be ok if the diagram was just hey its my own thing i set
 my rules - fine but the fanfare around it gives it a different
 meaning and thus the controversy above.
 
 .. just tried to put in words what might be a general unspoken feeling..
 
 Short message recap
 a) ckan - nice why not might be useful but..
 b) generated diagram : we have the data or can collect it so whoever
 is interested in analitics pls let us know and we can work it out
 (matter of fact it turns out most uf us in here are paid by EU for
 doing this in collaborative projects :-) )
 
 cheers
 Giovanni

[CfP] Future Internet Session at the Future Internet Assembly, Ghent, 16 December 2010

2010-10-06 Thread Michael Hausenblas


Call for Position Papers for the Future Internet Session
³Linked Data in the Future Internet² at the
Future Internet Assembly, Ghent, 16 December 2010
http://www.fi-ghent.eu/
http://www.future-internet.eu/


The Future Internet sparked the interest of many different
communities. All of these communities develop specific parts of
infrastructure, which at one point of time need to be able to
interoperate. Unfortunately, currently the Future Internet
architecture does not include means to achieve interoperability at a
data level. At the same time Linked Data is becoming an accepted best
practice to exchange information in an interoperable and reusable
fashion. Many different communities on the Internet use Linked Data
standards to provide and exchange interoperable information. This is
strikingly confirmed by the dramatically growing Linked Data cloud
(http://lod-cloud.net/) and the currently more than 25 billion facts
represented and interconnected therein with exponential growth rates
both in terms of data sets and contained data.

The OSI/OSI 7-Layer architecture is a conceptual view on networking
architectures. One possible view is a look at Linked Data as an
independent layer in the Internet architecture, on top of the
networking layer, but below the application layers, since it provides
a common data model for all applications as shown in the figure below.
This session investigates this view, what implications this imposes on
the Future Internet Architecture, but also how future architectures
and system developments can benefit from this new layer.

We are looking for position papers regarding the use of Linked Data in
the Future Internet. These can be either concrete current use-cases or
envisioned usages for the topics relevant for the Future Internet
(examples include: Internet of Things, embedded systems, FIRE,
services, smart cities., Open Government Data, Future Internet
Architecture and others).
The papers provide an input for the ongoing discussion on the role of
Linked Data for the Future Internet.

Submission
Your position paper should have between 1 and 10 pages. We encourage
authors to comply with the Springer LNCS format (see
http://www.springer.com/computer/lncs?SGWID=0-164-6-793341-0 ).

Position papers can be submitted until 30th November 2010 by email to
futureinter...@semanticweb.org
in HTML or PDF.

***Selection***
The session¹s organizers reserve the right to do a relevance check of
submitted position papers and reject papers, which are clearly not
relevant to the topic outlined above.

***Publication***
Submitted position papers will be published on a website related to
the Future Internet Assembly Linked Data Session and may influence
further developments in the Future Internet space.

Session Organisers
Sören Auer
Email: a...@informatik.uni-leipzig.de

Stefan Decker (main  contact)
Email:  stefan.dec...@deri.org

Manfred Hauswirth
Email: manfred.hauswi...@deri.org

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: Correct Usage of rdfs:idDefinedBy in Vocabulary Specifications with a Hash-based URI Pattern

2010-09-30 Thread Michael Hausenblas


Martin,

 Opinions?

We had the same discussion in the voiD team, see [1], and resolved it
eventually - hope this helps.

Cheers,
  Michael

[1] http://code.google.com/p/void-impl/issues/detail?id=45

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Martin Hepp martin.h...@ebusiness-unibw.org
 Date: Thu, 30 Sep 2010 09:06:46 +0200
 To: Linked Data community public-lod@w3.org
 Subject: Correct Usage of rdfs:idDefinedBy in Vocabulary Specifications with a
 Hash-based URI Pattern
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 30 Sep 2010 07:07:24 +
 
 Dear all:
 
 We use rdfs:isDefinedBy in all of our vocabularies (*) for linking
 between the conceptual elements and their specification.
 
 Now, there is a subtle question:
 
 Let's assume we have an ontology with the main URI
 
 http://purl.org/vso/ns
 
 All conceptual elements are defined as hash fragment URIs (URI
 references), e.g.
 
 http://purl.org/vso/ns#Bike
 
 The ontology itself (the instance of owl:Ontology) has the URI
 
 http://purl.org/vso/ns#
 
 http://purl.org/vso/ns#  a owl:Ontology ;
  owl:imports http://purl.org/goodrelations/v1 ;
  dc:title VSO: The Vehicle Sales Ontology for Semantic Web-based
 E-Commerce@en .
 
 So we have two URIs for the ontology:
 
 1. http://purl.org/vso/ns# for the ontology as an abstract artefact
 2. http://purl.org/vso/ns for the syntactical representation of the
 ontology (its serialization)
 
 Shall the rdfs:isDefinedBy statements refer to #1 or #2 ?
 
 #1
 vso:Vehicle a owl:Class ;
  rdfs:subClassOf gr:ProductOrService ;
  rdfs:label Vehicle (gr:ProductOrService)@en ;
  rdfs:isDefinedBy http://purl.org/vso/ns# .  ===
 
 #2
 vso:Vehicle a owl:Class ;
  rdfs:subClassOf gr:ProductOrService ;
  rdfs:label Vehicle (gr:ProductOrService)@en ;
  rdfs:isDefinedBy http://purl.org/vso/ns .   ===
 
 
 I had assumed they shall refer to #1, but that caused some debate
 within our group ;-)
 
 Opinions?
 
 Best
 
 Martin

LDOW10 proceedings now available via CEUR-WS.org

2010-09-03 Thread Michael Hausenblas


All,

This is to announce the availability of the Proceedings of the WWW2010
Workshop on Linked Data on the Web (LDOW2010) via CEUR-WS.org [1].

Cheers,
  Michael, on behalf of the organisers Chris, Tom and Tim

[1] http://ceur-ws.org/Vol-628

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Europe launches Linked Data support (and how you can benefit from it)

2010-09-01 Thread Michael Hausenblas


All,

I'm happy and proud to announce that the LOD Around The Clock (LATC) Support
Action [1], an European FP7 project has started today. Our primary goal is
to support people and institutions to publish and consume Linked Data.

If you're interested in more details or want to learn how you can
participate in and benefit from LATC, please contact me. You may also want
to follow us on Twitter [2].

Cheers,
  Michael

[1] http://latc-project.eu/
[2] http://twitter.com/latcproject

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: Europe launches Linked Data support (and how you can benefit from it)

2010-09-01 Thread Michael Hausenblas


Juan,

 Is this only for Europe?

Glad you asked ;)

No, this is not only for Europe, but funded by the European Commission. So,
we're more than happy to support people and institutions all over the world.

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Juan Sequeda juanfeder...@gmail.com
 Date: Wed, 1 Sep 2010 09:22:54 -0500
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: Linked Data community public-lod@w3.org
 Subject: Re: Europe launches Linked Data support (and how you can benefit from
 it)
 
 Is this only for Europe?
 
 Juan Sequeda
 +1-575-SEQ-UEDA
 www.juansequeda.com
 
 
 On Wed, Sep 1, 2010 at 3:51 AM, Michael Hausenblas 
 michael.hausenb...@deri.org wrote:
 
 
 All,
 
 I'm happy and proud to announce that the LOD Around The Clock (LATC)
 Support
 Action [1], an European FP7 project has started today. Our primary goal is
 to support people and institutions to publish and consume Linked Data.
 
 If you're interested in more details or want to learn how you can
 participate in and benefit from LATC, please contact me. You may also want
 to follow us on Twitter [2].
 
 Cheers,
  Michael
 
 [1] http://latc-project.eu/
 [2] http://twitter.com/latcproject
 
 --
 Dr. Michael Hausenblas
 LiDRC - Linked Data Research Centre
 DERI - Digital Enterprise Research Institute
 NUIG - National University of Ireland, Galway
 Ireland, Europe
 Tel. +353 91 495730
 http://linkeddata.deri.ie/
 http://sw-app.org/about.html

Re: Show me the money - (was Subjects as Literals)

2010-07-01 Thread Michael Hausenblas

 I am still not hearing any argument to justify the costs of literals as
 subjects.

+1

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Jeremy Carroll jer...@topquadrant.com
 Date: Thu, 01 Jul 2010 08:38:00 -0700
 To: Yves Raimond yves.raim...@gmail.com
 Cc: Pat Hayes pha...@ihmc.us, Toby A Inkster t...@g5n.co.uk, David Booth
 da...@dbooth.org, nat...@webr3.org, Dan Brickley dan...@danbri.org,
 Linked Data community public-lod@w3.org, Semantic Web community
 semantic-...@w3.org
 Subject: Show me the money - (was  Subjects as Literals)
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 01 Jul 2010 15:38:42 +
 
 
 I am still not hearing any argument to justify the costs of literals as
 subjects
 
 I have loads and loads of code, both open source and commercial that
 assumes throughout that a node in a subject position is not a literal,
 and a node in a predicate position is a URI node.
 
 Of course, the correct thing to do is to allow all three node types in
 all three positions. (Well four if we take the graph name as well!)
 
 But if we make a change,  all of my code base will need to be checked
 for this issue.
 This costs my company maybe $100K (very roughly)
 No one has even showed me $1K of advantage for this change.
 
 It is a no brainer not to do the fix even if it is technically correct
 
 Jeremy

Re: Slightly off topic - content negotiation by language accept headers

2010-06-23 Thread Michael Hausenblas


Michael,



Cheers,
  Michael

[1] http://www.w3.org/QA/2006/02/content_negotiation.html
-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Michael Smethurst michael.smethu...@bbc.co.uk
 Date: Wed, 23 Jun 2010 15:55:09 +0100
 To: Linked Data community public-lod@w3.org
 Subject: Slightly off topic - content negotiation by language accept headers
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Wed, 23 Jun 2010 14:55:28 +
 
 Hello
 
 Realise this is slightly off topic for this list but since you people know
 the most about content negotiation of the people I know I thought I'd try
 here first. So...
 
 ...does anyone know of any real world sites that content negotiate on
 language accept headers? Yves has pointed out that Google search does do
 this so if I request google.co.uk with german set above english in my
 browser preferences it serves a page at co.uk in german. But I'm not sure if
 any other sites are doing this... Is it something anyone here has tried with
 eg dbpedia?
 
 Also unsure how many browsers support this setting. I can see and use the
 setting in mac firefox 3 but can't find anything in the preferences for
 either safari or chrome
 
 Finally wondering how google et al treat a site that does conneg on
 language. If the same url can serve french and english will it be indexed as
 both? Do search bots send out language accept headers?
 
 Any help (including pointers elsewhere) much appreciated
 
 Cheers
 Michael
 
 
 http://www.bbc.co.uk/
 This e-mail (and any attachments) is confidential and may contain personal
 views which are not the views of the BBC unless specifically stated.
 If you have received it in error, please delete it from your system.
 Do not use, copy or disclose the information in any way nor act in reliance on
 it and notify the sender immediately.
 Please note that the BBC monitors e-mails sent or received.
 Further communication will signify your consent to this.

Re: Slightly off topic - content negotiation by language accept headers

2010-06-23 Thread Michael Hausenblas


Michael,

(sorry for the last post, hit accidentally the send button ;)

The best overview I'm aware of is a W3C QA blog post [1], contains also some
valuable pointers - hope that helps.

Cheers,
  Michael

[1] http://www.w3.org/QA/2006/02/content_negotiation.html

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Michael Smethurst michael.smethu...@bbc.co.uk
 Date: Wed, 23 Jun 2010 15:55:09 +0100
 To: Linked Data community public-lod@w3.org
 Subject: Slightly off topic - content negotiation by language accept headers
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Wed, 23 Jun 2010 14:55:28 +
 
 Hello
 
 Realise this is slightly off topic for this list but since you people know
 the most about content negotiation of the people I know I thought I'd try
 here first. So...
 
 ...does anyone know of any real world sites that content negotiate on
 language accept headers? Yves has pointed out that Google search does do
 this so if I request google.co.uk with german set above english in my
 browser preferences it serves a page at co.uk in german. But I'm not sure if
 any other sites are doing this... Is it something anyone here has tried with
 eg dbpedia?
 
 Also unsure how many browsers support this setting. I can see and use the
 setting in mac firefox 3 but can't find anything in the preferences for
 either safari or chrome
 
 Finally wondering how google et al treat a site that does conneg on
 language. If the same url can serve french and english will it be indexed as
 both? Do search bots send out language accept headers?
 
 Any help (including pointers elsewhere) much appreciated
 
 Cheers
 Michael
 
 
 http://www.bbc.co.uk/
 This e-mail (and any attachments) is confidential and may contain personal
 views which are not the views of the BBC unless specifically stated.
 If you have received it in error, please delete it from your system.
 Do not use, copy or disclose the information in any way nor act in reliance on
 it and notify the sender immediately.
 Please note that the BBC monitors e-mails sent or received.
 Further communication will signify your consent to this.

Re: 303 redirect to a fragment what should a linked data client do?

2010-06-10 Thread Michael Hausenblas


Christoph,
 
Are you aware of the respective HTTPbis ticket [1]?

Cheers,
  Michael

[1] http://trac.tools.ietf.org/wg/httpbis/trac/ticket/43

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Christoph LANGE ch.la...@jacobs-university.de
 Organization: Jacobs University Bremen
 Date: Thu, 10 Jun 2010 13:40:42 +0200
 To: Linked Data community public-lod@w3.org
 Subject: 303 redirect to a fragment    what should a linked data client do?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 10 Jun 2010 11:40:31 +
 
 Hi all,
 
   in our setup we are still somehow fighting with ill-conceived legacy URIs
 from the pre-LOD age.  We heavily make use of hash URIs there, so it could
 happen that a client, requesting http://example.org/foo#bar (thus actually
 requesting http://example.org/foo) gets redirected to
 http://example.org/baz#grr (note that I don't mean
 http://example.org/baz%23grr here, but really the un-escaped hash).  I
 observed that when serving such a result as XHTML, the browser (at least
 Firefox) scrolls to the #grr fragment of the resulting page.
 
 But what should an RDF-aware client do?  I guess it should still look out for
 triples with the originally requested subject http://example.org/foo#bar, e.g.
 rdf:Description rdf:about=http://example.org/foo#bar;, or (assuming
 xml:base=http://example.org/foo;) for rdf:Description rdf:ID=bar.  Is my
 assumption right?
 
 Thanks in advance for any help,
 
 Christoph
 
 -- 
 Christoph Lange, Jacobs Univ. Bremen, http://kwarc.info/clange, Skype duke4701

Re: Describing Images (and similar), and Descriptor discovery.

2010-06-09 Thread Michael Hausenblas


Nathan,

From the TAG, related, maybe helps you a bit [1].

Cheers,
  Michael

[1] http://lists.w3.org/Archives/Public/www-tag/2010Feb/.html

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Wed, 09 Jun 2010 14:01:32 +0100
 To: Linked Data community public-lod@w3.org, Semantic Web community
 semantic-...@w3.org
 Subject: Describing Images (and similar), and Descriptor discovery.
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Wed, 09 Jun 2010 13:02:35 +
 
 Hi All,
 
 I'm just wondering what approaches people are taking to describing non
 rdf/html resources, such as Images, PDFs and similar?
 
 Given that we have a jpeg with the URL http://example.org/image.jpg
 would we:
 
 give it the Identifier http://example.org/image.jpg#this and serve an
 RDF description via conneg
 
 give it the Identifer http://example.org/image#this and again serve an
 RDF description via conneg - a possible issue introduced here is if you
 have an alternative SVG version with it's own fragments(?) (SVGTINY12[1])
 
 give it a completely different Identifier
 http://example.org/r/132#image and 'link' from the descriptor to the
 image with..? (dcterms:hasFormat, sioc:link, uri:uri, link:uri, other?)
 
 and on the reverse, how about descriptor discovery for images/PDFs etc,
 expose via the Link header (tight coupling to HTTP), or?
 
 As a side but related question, do we see the Web Of Data as running
 autonomous to the Web of Documents, as in it is taken that rdf / linked
 data clients will purely run over the web of linked data and reference
 non rdf resources via links with no backwards discovery needed, or is
 the link from web of documents back to web of data needed by any
 specific use cases? does conneg suffice? what if the image is
 ftp://example.org/image.jpg?
 
 Best,
 
 Nathan
 
 [1] http://www.w3.org/TR/2008/REC-SVGTiny12-20081222

Re: Organization ontology

2010-06-01 Thread Michael Hausenblas


Dave,

 We would like to announce the availability of an ontology for
 description of organizational structures including government organizations.

Brilliant! I submitted it now to Sindice [1] and 'registered' the org prefix
in prefix.cc [2] - you might want to support it by voting it up ;)

Cheers,
  Michael

[1] 
http://sindice.com/search?q=domain%3Awww.w3.org+Core+organization+ontologyq
t=term
[2] http://prefix.cc/org

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Dave Reynolds dave.e.reyno...@googlemail.com
 Date: Tue, 01 Jun 2010 08:50:32 +0100
 To: Linked Data community public-lod@w3.org, public-egov...@w3.org
 public-egov...@w3.org
 Subject: Organization ontology
 Resent-From: public-egov...@w3.org public-egov...@w3.org
 Resent-Date: Tue, 01 Jun 2010 07:51:09 +
 
 We would like to announce the availability of an ontology for
 description of organizational structures including government organizations.
 
 This was motivated by the needs of the data.gov.uk project. After some
 checking we were unable to find an existing ontology that precisely met
 our needs and so developed this generic core, intended to be extensible
 to particular domains of use.
 
 The ontology is documented at [1] and some discussion on the
 requirements and design process are at [2].
 
 W3C have been kind enough to offer to host the ontology within the W3C
 namespace [3]. This does not imply that W3C endorses the ontology, nor
 that it is part of any standards process at this stage. They are simply
 providing a stable place for posterity.
 
 Any changes to the ontology involving removal of, or modification to,
 existing terms (but not necessarily addition of new terms) will be
 announced to these lists. We suggest that any discussion take place on
 the public-lod list to avoid further cross-posting.
 
 Dave, Jeni, John
 
 [1] http://www.epimorphics.com/public/vocabulary/org.html
 [2] 
 http://www.epimorphics.com/web/category/category/developers/organization-ontol
 ogy
 [3] http://www.w3.org/ns/org# (available in RDF/XML, N3, Turtle via
 conneg or append .rdf/.n3/.ttl)

Re: Java Framework for Content Negotiation

2010-05-20 Thread Michael Hausenblas


 There's also Jersey [1]  ...

+1 to Jersey - had overall very good experience with it. If you want to have
a quick look (not saying it's beautiful/exciting, but might helps to
kick-start things) see [1] for my hacking with it.

Cheers,
  Michael

[1] http://bitbucket.org/mhausenblas/sparestfulql/

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Dave Reynolds dave.e.reyno...@googlemail.com
 Date: Thu, 20 May 2010 11:08:03 +0100
 To: Angelo Veltens angelo.velt...@online.de
 Cc: Linked Data community public-lod@w3.org
 Subject: Re: Java Framework for Content Negotiation
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 20 May 2010 10:08:45 +
 
 On 20/05/2010 11:03, Story Henry wrote:
 There is the RESTlet framework http://www.restlet.org/
 
 There's also Jersey [1] and, for a minimalist solution to just the
 content matching piece see Mimeparse [2].
 
 Dave
 
 [1] https://jersey.dev.java.net/
 [2] http://code.google.com/p/mimeparse/
 
 On 20 May 2010, at 10:49, Angelo Veltens wrote:
 
 Hello,
 
 I am just looking for a framework to do content negotiation in java.
 Currently I am checking the HttpServletRequest myself quickdirty. Perhaps
 someone can recommend a framework/library that has solved this already.
 
 Thanks in advance,
 Angelo

Re: Java Framework for Content Negotiation

2010-05-20 Thread Michael Hausenblas

Angelo,

 I might have a non-information resource http://example.org/resource/foo
 
 I could place a REST-Webservice there and do content negotiation with
 @GET / @Produces Annotations. But this seems not correct to me, because
 it is a non-information resource and not a html or rdf/xml document. So
 it should never return html or rdf/xml but do a 303 redirect to an
 information resource instead, doesn't it?

This is a recurring pattern and people tend to confuse things (conneg and
303), in my experience. I assume you've read [1], already ? ;)

Without more detailed knowledge about what you want to achieve it is hard
for me to tell you anything beyond what has been discussed in various
forums.

Can you give me a more concrete description of your setup and goals? How
does your data look like? What's the task you try to solve? Etc.

Cheers,
  Michael

[1] http://www.w3.org/TR/cooluris/

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Angelo Veltens angelo.velt...@online.de
 Date: Thu, 20 May 2010 14:38:53 +0200
 To: Linked Data community public-lod@w3.org
 Subject: Re: Java Framework for Content Negotiation
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Thu, 20 May 2010 12:39:34 +
 
 On 20.05.2010 12:18, Michael Hausenblas wrote:
 There's also Jersey [1]  ...
  
 +1 to Jersey - had overall very good experience with it. If you want to have
 a quick look (not saying it's beautiful/exciting, but might helps to
 kick-start things) see [1] for my hacking with it.
 
 Cheers,
Michael
 
 [1] http://bitbucket.org/mhausenblas/sparestfulql/

 
 Mmh, i have been thinking about using REST-Webservice already, but there
 is one thing i'm quite unsteady with:
 
 I might have a non-information resource http://example.org/resource/foo
 
 I could place a REST-Webservice there and do content negotiation with
 @GET / @Produces Annotations. But this seems not correct to me, because
 it is a non-information resource and not a html or rdf/xml document. So
 it should never return html or rdf/xml but do a 303 redirect to an
 information resource instead, doesn't it?
 
 Kind regards,
 Angelo

Re: [dady] Dataset Dynamics meet-up at WWW2010

2010-04-28 Thread Michael Hausenblas


Sandro,

(funny, I posted this last Friday and it showed up only yesterday ...)

 I think for the use cases I have in mind (large scale, ad hoc, real-time
 mirroring of RDF), a key requirement is constant time (per triple) to
 apply deltas, including maintaining a secure hash.  I was happy to see I
 could (I think) meet this with some tweaking of blank nodes.  I sketched
 both a delta format (gruf) and a subscription protocol (websub), which
 are separate. 
 
 Rough specs are here:
http://websub.org/wiki/GRUF
http://websub.org/wiki/Spec

This looks great, thanks! It would be interesting to learn more about the
status of this project (are implementations available, etc.) and your plans
with it.

Indeed, as I recently wrote [1], there are plenty of approaches and
proposals out there and I think the time is ripe to sit together, get more
practical experience in implementing and deploying stuff.

I hope you can make it to the Dataset Dynamics meeting [2] and introduce
your proposal to the community. I'll sync with Juergen to catch up.

Cheers,
  Michael

[1] http://blog.semantic-web.at/2010/04/26/a-dynamic-web-of-data/
[2] http://esw.w3.org/DatasetDynamics/Meetings

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Sandro Hawke san...@w3.org
 Reply-To: dady dataset-dynam...@googlegroups.com
 Date: Tue, 27 Apr 2010 14:53:39 -0400
 To: dady dataset-dynam...@googlegroups.com
 Cc: Linked Data community public-lod@w3.org, Jürgen Umbrich
 juergen.umbr...@deri.org
 Subject: Re: [dady] Dataset Dynamics meet-up at WWW2010
 
 
 Changes in Linked Data sources (dataset dynamics) and how to deal with it
 are an important and emerging issue [1][2].
 
 As already mentioned, there will be a dataset dynamics meet-up at WWW2010. I
 first planned to register a BoF, but it is still unclear if this is possible
 [3].
 
 I'd now propose to have a break-out session at the W3C LOD Track [4] - as I
 won't be able to make it to WWW, Juergen Umbrich (in CC) would take care of
 the local organisation.
 
 Sounds like a good idea, although I don't know what else might be on the
 menu.
 
 So, I just learned of the dataset dynamics term and community last
 week (from Michael), but I've been thinking about this for many years.
 I got inspired and sketched out a design a few months ago, which I think
 is pretty good.  I've been hoping to return to it some day soon, but if
 we're talking about this Thursday, I might was well share the drafts
 now.
 
 I think for the use cases I have in mind (large scale, ad hoc, real-time
 mirroring of RDF), a key requirement is constant time (per triple) to
 apply deltas, including maintaining a secure hash.  I was happy to see I
 could (I think) meet this with some tweaking of blank nodes.  I sketched
 both a delta format (gruf) and a subscription protocol (websub), which
 are separate. 
 
 Rough specs are here:
http://websub.org/wiki/GRUF
http://websub.org/wiki/Spec
 
   -- Sandro
 
 Cheers,
   Michael
 
 [1] http://esw.w3.org/DatasetDynamics
 [2] 
 http://data-gov.tw.rpi.edu/wiki/TWC_Data-gov_Vocabulary_Proposal#Change_of_d
 ataset
 [3] http://twitter.com/WWW2010/status/12452736301
 [4] http://esw.w3.org/Camps:LODCampW3CTrack#breakout
 
 -- 
 Dr. Michael Hausenblas
 LiDRC - Linked Data Research Centre
 DERI - Digital Enterprise Research Institute
 NUIG - National University of Ireland, Galway
 Ireland, Europe
 Tel. +353 91 495730
 http://linkeddata.deri.ie/
 http://sw-app.org/about.html
 
 
 
 
 -- 
 Subscription settings: http://groups.google.com/group/dataset-dynamics/subscr
 ibe?hl=en

Dataset Dynamics meet-up at WWW2010

2010-04-23 Thread Michael Hausenblas


All,

Changes in Linked Data sources (dataset dynamics) and how to deal with it
are an important and emerging issue [1][2].

As already mentioned, there will be a dataset dynamics meet-up at WWW2010. I
first planned to register a BoF, but it is still unclear if this is possible
[3].

I'd now propose to have a break-out session at the W3C LOD Track [4] - as I
won't be able to make it to WWW, Juergen Umbrich (in CC) would take care of
the local organisation.

Cheers,
  Michael

[1] http://esw.w3.org/DatasetDynamics
[2] 
http://data-gov.tw.rpi.edu/wiki/TWC_Data-gov_Vocabulary_Proposal#Change_of_d
ataset
[3] http://twitter.com/WWW2010/status/12452736301
[4] http://esw.w3.org/Camps:LODCampW3CTrack#breakout

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: [foaf-protocols] ACL

2010-04-20 Thread Michael Hausenblas

Nathan,

That sort of reminds me of something [1] ;)

So, I asked a round a bit [2] and the answer essentially was: go register
one ... fancy doing it together?

Cheers,
  Michael

[1] http://webofdata.wordpress.com/2010/03/04/wod-access-control-discovery/
[2] http://lists.w3.org/Archives/Public/ietf-http-wg/2010JanMar/0218.html

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Mon, 19 Apr 2010 22:37:41 +0100
 To: Linked Data community public-lod@w3.org, foaf-protocols
 foaf-protoc...@lists.foaf-project.org
 Subject: [foaf-protocols] ACL
 
 Hi All,
 
 I'm just trying to get an implementation of web access control [1] off
 the ground and have hit upon a small issue.
 
 I'm planning on exposing links to acl files via the Link header as
 directed, however I've realised there is no rel= for it, hence i was
 opting for a custom temporary type. On a first look a relation of
 acl:acl looks to be the one, but after checking the actual ontology the
 acl:acl link simply isn't there, thus in the meantime I've opted for:
 
 Link: /.wac/everyone.n3; rel=http://www.w3.org/ns/auth/acl#;;
 title=Access Control File
 
 Any improvements, or refinements welcome, as the above is just a
 temporary measure.
 
 Best,
 
 Nathan
 ___
 foaf-protocols mailing list
 foaf-protoc...@lists.foaf-project.org
 http://lists.foaf-project.org/mailman/listinfo/foaf-protocols

Re: [foaf-protocols] ACL

2010-04-20 Thread Michael Hausenblas


 Indeed! I've started implementing it last night (figured it was time to
 do it, rather than ponder and debate it!)

+1

Where? :)

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Tue, 20 Apr 2010 15:05:38 +0100
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: Linked Data community public-lod@w3.org, foaf-protocols
 foaf-protoc...@lists.foaf-project.org
 Subject: Re: [foaf-protocols] ACL
 
 Michael Hausenblas wrote:
 Nathan,
 
 That sort of reminds me of something [1] ;)
 
 Indeed! I've started implementing it last night (figured it was time to
 do it, rather than ponder and debate it!) So far it's been relatively
 easy and have managed to get basic ACL / ACF implemented and working.
 
 Also made a non-sparql dependant FOAF+SSL implementation which I'll be
 adding to libAuthenticate w/ Lazlo, Melvin etc over the next week or so.
 
 So, I asked a round a bit [2] and the answer essentially was: go register
 one ... fancy doing it together?
 
 Yup certainly do :)
 
 ACL Ontology wise afaict what's needed is the inverse of acl:accessTo -
 resource acl:acl acf or suchlike.
 
 However, I've also got another couple of suggestions for the acl
 ontology which I'll send through under different cover.
 
 Cheers,
   Michael
 
 Likewise,
 
 Nathan
 
 [1] http://webofdata.wordpress.com/2010/03/04/wod-access-control-discovery/
 [2] http://lists.w3.org/Archives/Public/ietf-http-wg/2010JanMar/0218.html
 
 Other related reading for the archives:
 
 http://esw.w3.org/WebAccessControl
 http://esw.w3.org/Talk:WebAccessControl
 http://esw.w3.org/WebAccessControl
 http://www.w3.org/DesignIssues/CloudStorage.html
 http://www.w3.org/DesignIssues/ReadWriteLinkedData.html
 http://dig.csail.mit.edu/2009/Papers/ISWC/rdf-access-control/paper.pdf
 http://dig.csail.mit.edu/2009/presbrey/UAP.pdf
 http://linkeddata.deri.ie/sites/linkeddata.deri.ie/files/rw-wod-tr.pdf

Dataset dynamics

2010-04-19 Thread Michael Hausenblas


All,

Indeed a very exciting weekend concerning dataset dynamics [1]. I got the
feeling that we, the dataset dynamics group [2], didn't do an awful good job
re marketing so far, given that many people active in this area were not
aware of its existence ;) - for the background see also the recent NodMag
article Keeping up with a LOD of Changes [3] ...

Hence, I'd like to invite people interested in this area to join in and
discuss the next steps in this emerging and important area (WWW could be a
good place for a BoF or the like).

shameless-self-plug
Dataset dynamics is also a hot topic at the upcoming LDOW2010 workshop. I
invite you to have a look at our paper Towards Dataset Dynamics: Change
Frequency of Linked Open Data Sources [4] and in case you're at WWW2010,
chime in and contribute to the discussion [5].
/shameless-self-plug


Cheers,
  Michael

[1] http://esw.w3.org/DatasetDynamics
[2] http://groups.google.com/group/dataset-dynamics
[3] http://www.talis.com/nodalities/pdf/nodalities_issue9.pdf
[4] http://events.linkeddata.org/ldow2010/papers/ldow2010_paper12.pdf
[5] http://events.linkeddata.org/ldow2010/#programme

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html

Re: [semanticweb] ANN: DBpedia 3.5 released

2010-04-14 Thread Michael Hausenblas


Leigh,

You might find some answers in our recent WebSci 2010 paper:

Knud Möller, Michael Hausenblas, Richard Cyganiak, Siegfried Handschuh and
Gunnar Grimnes. Learning from Linked Open Data Usage: Patterns  Metrics.
Web Science Conference 2010 [1].
 
Cheers,
  Michael

[1] http://linkeddata.deri.ie/sites/default/files/lod-usage-websci-2010.pdf

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Leigh Dodds leigh.do...@talis.com
 Date: Wed, 14 Apr 2010 12:33:45 +0100
 To: Ivan Mikhailov imikhai...@openlinksw.com
 Cc: baran ba...@goldmail.de, semanticweb semantic...@yahoogroups.com,
 Linked Data community public-lod@w3.org, Semantic Web community
 semantic-...@w3.org, dbpedia-discussion
 dbpedia-discuss...@lists.sourceforge.net, dbpedia-announcements
 dbpedia-announceme...@lists.sourceforge.net, Chris Bizer ch...@bizer.de
 Subject: Re: [semanticweb] ANN: DBpedia 3.5 released
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Wed, 14 Apr 2010 11:44:24 +
 
 Hi,
 
 2010/4/14 Ivan Mikhailov imikhai...@openlinksw.com:
 Similarly, growing database size and growing hit rate and growing
 complexity of queries are not obviously visible from outside, but turn
 the hosting into a race. We're improving the underlaying RDBMS as fast
 as we only can just to prevent the service from total halt. One might
 wish to provide a better service on their own RDBMS and thus to make a
 good advertisement, but nobody else want to do that _and_ can do that,
 so we're alone under this load.
 
 Out of interest, do you actually share any metrics on usage levels,
 common sparql queries, etc?
 
 We have a copy of the dbpedia data loaded into the Talis Platform, but
 its not yet up to date with 3.5. So there's more than one option
 already. Although the service characteristics/features are different
 (different software)
 
 Cheers,
 
 L.
 
 -- 
 Leigh Dodds
 Programme Manager, Talis Platform
 Talis
 leigh.do...@talis.com
 http://www.talis.com

Re: Using predicates which have no ontology?

2010-04-06 Thread Michael Hausenblas


Ed,
 
 Would it be hard to remove the empty literal assertions? e.g.

Fixed now. Dunno why I had it there in the first place ;)

 It's interesting that the latest efforts to create a Link Relation
 Registry seem to be intentionally avoiding publishing machine readable
 data for the registry [1]. I was wondering if Mark Nottingham's
 efforts to revamp link relations might present a good opportunity for
 us to lobby the IETF to start publishing a bit of RDFa for the link
 relations registry...

Agree! Let's lobby :)


Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Ed Summers e...@pobox.com
 Date: Mon, 5 Apr 2010 09:37:49 -0400
 To: Linked Data community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Mon, 05 Apr 2010 13:38:22 +
 
 Hi Michael,
 
 Would it be hard to remove the empty literal assertions? e.g.
 
 --
 http://www.iana.org/assignments/relation/alternate a awol:RelationType ;
  rdfs:label alternate ;
  dcterms:dateAccepted  ;
  dcterms:description  ;
  rdfs:isDefinedBy http://www.iana.org/go/rfc4287 .
 --
 
 It's interesting that the latest efforts to create a Link Relation
 Registry seem to be intentionally avoiding publishing machine readable
 data for the registry [1]. I was wondering if Mark Nottingham's
 efforts to revamp link relations might present a good opportunity for
 us to lobby the IETF to start publishing a bit of RDFa for the link
 relations registry...
 
 //Ed
 
 [1] http://tools.ietf.org/html/draft-nottingham-http-link-header-09#appendix-A

Re: Using predicates which have no ontology?

2010-04-06 Thread Michael Hausenblas


 If not, would you consider updating your interim solution to describe
 URI:s under [1]? I mean, since [2] currently uses the real IANA URI:s
 (i.e. the unsanctioned ones) and those, as Danny cautioned, could
 end up e.g. being resolved to documents, breaking semantics (as well
 as not being discoverable).

I'm not totally sure if I understand but I guess the answer would be yes ;)

It's interesting that you've modelled the relation-type as RDF properties in
[4] whereas I turned them (in [1]) into instances of the class
'awol:RelationType' from the AtomOwl vocabulary.

Any thoughts?

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Niklas Lindström lindstr...@gmail.com
 Date: Sat, 3 Apr 2010 22:46:29 +0200
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: nat...@webr3.org, Danny Ayers danny.ay...@gmail.com, Phil Archer
 p...@philarcher.org, Linked Data community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 
 Hi Michael,
 
 that's great! If [2] were to be updated with that [1] (i.e. officially
 containing RDFa about these URI:s), and would be 303:d to from [3]
 (along with anything under that URL), this would be all we need. I
 know it hasn't happened for years, but sometimes a nudge at just the
 right time may be all it takes..
 
 If not, would you consider updating your interim solution to describe
 URI:s under [1]? I mean, since [2] currently uses the real IANA URI:s
 (i.e. the unsanctioned ones) and those, as Danny cautioned, could
 end up e.g. being resolved to documents, breaking semantics (as well
 as not being discoverable).
 
 I did a manual (well, vim-macro:ed) conversion of [3] into RDF/XML,
 but had to leave to eat easter eggs at my sister's and entertain her
 kids. :) It's located at [4] now, and quite similar to the data in
 [1]. Note that I do consider [1] much more interesting.
 
 (That said, if anyone would like me to make e.g. an XSLT for turning
 [4] into something like [1], just say the word.)
 
 Best regards and happy easter!
 Niklas
 
 [1]: http://purl.org/NET/atom-link-rel
 [2]: http://www.iana.org/assignments/link-relations/link-relations.xhtml
 [3]: http://www.iana.org/assignments/relation/
 [4]: http://bitbucket.org/niklasl/tripleheap/src/tip/iana-link-relations.rdf
 
 
 On Sat, Apr 3, 2010 at 8:38 PM, Michael Hausenblas
 michael.hausenb...@deri.org wrote:
 
 Nathan, Phil, All,
 
 and quote:
 If the relation-type is a relative URI, its base URI MUST be
    considered to be http://www.iana.org/assignments/relation/;
 http://tools.ietf.org/id/draft-nottingham-http-link-header-03.txt
 
 obviously all the links defined by:
 http://www.iana.org/assignments/link-relations/link-relations.xhtml
 (from the atom rfc)
 
 such as edit, self, related etc - with additional consideration to the
 thought that these will end up in rdf via RDFa/grddl etc v soon if not
 already.
 
 Any guidance?
 
 Yes. Use [1] ...
 
 My motto is: acting rather than talking. So, I took [2] as a starting point
 - which is already in nice XHTML format - and manually added some RDFa.
 After an hour I ended up with [1] (though, to be fair, two Wii games with
 the kids and consuming some Easter eggs also took place in that hour).
 
 So, [1] is really a sort of an interim solution (though, in the distributed
 data world I do expect much more of such fixes) and I encourage Phil, who is
 an editor of [2] to use the template from [1] at the 'official' location.
 
 Happy Easter! (and back to Wii games, for now ;)
 
 Cheers,
      Michael
 
 [1] http://purl.org/NET/atom-link-rel
 [2] http://www.iana.org/assignments/link-relations/link-relations.xhtml
 
 --
 Dr. Michael Hausenblas
 LiDRC - Linked Data Research Centre
 DERI - Digital Enterprise Research Institute
 NUIG - National University of Ireland, Galway
 Ireland, Europe
 Tel. +353 91 495730
 http://linkeddata.deri.ie/
 http://sw-app.org/about.html
 
 
 
 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Sat, 03 Apr 2010 00:14:16 +0100
 To: Danny Ayers danny.ay...@gmail.com
 Cc: Linked Data community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Fri, 02 Apr 2010 23:14:54 +
 
 Danny Ayers wrote:
 On 3 April 2010 00:53, Nathan nat...@webr3.org wrote:
 Hi All,
 
 Any guidance on using predicates in linked data / rdf which do not come
 from rdfs/owl. Specifically I'm considering the range of:
  http://www.iana.org/assignments/relation/*
 
 Can't find a URL that resolves there
 
 snap; but that's what rel=edit and so forth resolves to.
 
 see example:
 http://www.w3.org/2001/tag/doc/selfDescribingDocuments.html#ATOMSection
 
 and quote:
 If the relation-type is a relative URI, its

Re: Using predicates which have no ontology?

2010-04-06 Thread Michael Hausenblas


Thanks a lot Phil (for the clarification and the explanation). You helped
indeed much more than you think you did, IMO ;)

Agree to FUP with mnot on HTTP WG's mailing list, maybe with an XSLT handy,
as you suggest.

Cheers,
  Michael

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Phil Archer p...@philarcher.org
 Date: Tue, 06 Apr 2010 16:22:16 +0100
 To: Michael Hausenblas michael.hausenb...@deri.org
 Cc: Niklas Lindström lindstr...@gmail.com, Kingsley Idehen
 kide...@openlinksw.com, nat...@webr3.org, Danny Ayers
 danny.ay...@gmail.com, Linked Data community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 
 Hi all,
 
 Thanks for keeping me in this loop and apologies for radio silence thus far.
 
 On a theoretical level - making the link registry available as data is,
 clearly, a jolly good idea and should happen.
 
 On a practical level I am sorry to say I don't think I can help. In the
 e-mail that Michael sent to bring me in to this discussion he said that
 I was an editor of the Atom registry. Sorry, no, I'm not.
 
 The ATOM Link registry is under the control of the IESG [1]. To get
 'describedby' in there I had to send an e-mail to IANA [2].
 
 But... it's all meant to be temporary. Version 09 of Mark Nottingham's
 HTTP Link header Internet Draft has just been published and, if, as
 we've been hoping for longer than I can remember, it becomes a full RFC
 then the ATOM Link registry will be replaced by a new registry [3].
 
 The current XML version of the registry has a bunch of declarations that
 suggest that IANA is open to making different versions available if they
 can be automated. An XSLT that produced triples would be pretty simple I
 guess (linked GRDDL-style?)
 
 The informal place to raise issues around MNot's draft is the HTTP WG's
 mailing list (see announcement at [4]). Mark may be open to persuasion
 on seeking a data version of the registry. Alternatively one could write
 directly to IANA.
 
 Sorry I can't be of more direct practical help.
 
 Phil.
 
 
 [1] http://www.ietf.org/iesg/
 [2] http://lists.w3.org/Archives/Public/public-powderwg/2009Feb/0007.html
 [3] http://tools.ietf.org/html/draft-nottingham-http-link-header-09
 [4] http://lists.w3.org/Archives/Public/ietf-http-wg/2010AprJun/0014.html
 
 
 Niklas Lindström wrote:
 Kingsley,
 
 2010/4/6 Kingsley Idehen kide...@openlinksw.com:
 Niklas Lindström wrote:
 Niklas,
 
 Nice!
 
 I would once again suggest adding local owl:equivalentProperty
 assertions
 which enables a reasoner to treat the IANA URIs as synonyms. This is in
 line
 with what I like to call the: owl:shameAs pattern :-)
 
 Kingsley
 
 Hi Kingsley,
 
 thanks!
 
 Yes, I think that'd be good. But my sketch already describes the IANA
 URI:s directly (by, unsolicitedly, using
 @xml:base=http://www.iana.org/assignments/relation/;), so *if* that
 RDF (or preferably Michael's richer and RDFa-based one) were official,
 we wouldn't need that, right? (As those would be self-referential
 statements..)
 
 Otherwise, if we were to mint our own (community official) URI:s for
 each of these properties, I'd agree that owl:equivalentProperty should
 definitely be there..
 
 .. Well, unless it would be decided in the future that values in
 @rel:s at least in Atom are to be viewed as *indirect* references to
 relations via a document (akin to e.g. foaf:interest). Of course,
 that's not the case in XHTML+RDFa, but for the default names in @rel:s
 there the IANA URI:s aren't used (we have the
 http://www.w3.org/1999/xhtml/vocab#-based ones instead).
 
 So to nail down the definitions of (the nature of) the things the IANA
 relation URI:s identify, we'd either have to make it clear that they
 *are* relations (i.e. properties) in the RDF sense (and
 object-properties in the OWL sense), or that they're not. If it's
 undefined, we still can't really make any statements about what they
 are, even if we make up our own properties based on how we view them.
 (Well maybe, if it was declared that their precise meaning will be
 perpetually undefined.)
 
 So if they (the URI:s) are (direct references to relations), it'd be
 wonderful to have IANA publish some kind of RDF discoverable via [1]
 to make that clear.
 
 Thing is that we need RDF data representation now, and if we put the linked
 data somewhere (some data space) ASAP we can point to what will someday
 exist in an IANA data space -- the shameAs pattern is a productive
 mechanism for letting folks like IANA understand why this is so important
 etc. :-)
 
 absolutely. But do you think we should describe and use the IANA URI:s
 directly as properties, or that we need to mint new URI:s for them?
 The location of the document(s) containing these descriptions may very
 well be unreachable from iana.org for now

Re: Using predicates which have no ontology?

Niklas,

 While I have seen definitions of these relations made by the community
 before (e.g. used directly in AtomOwl, and a complete listing made by
 Ed Summers, which I unfortunately cannot find now),

You're not peradventure talking about [1], no?

Cheers,
  Michael

[1] http://mediatypes.appspot.com/

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Niklas Lindström lindstr...@gmail.com
 Date: Sat, 3 Apr 2010 14:28:43 +0200
 To: Danny Ayers danny.ay...@gmail.com
 Cc: Story Henry henry.st...@bblfish.net, nat...@webr3.org, Linked Data
 community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Sat, 03 Apr 2010 12:29:37 +
 
 Hi,
 
 I definitely think IETF should place RDF representations at those
 locations, as Henry suggests (e.g. 303 to say
 http://www.iana.org/assignments/relation.rdf). Is there really no
 way we could make this happen? Since the
 http://www.iana.org/assignments/relation/* URI:s are used directly
 in many places it would be very beneficial to have those be the direct
 property identifiers. (And since there is really no technology other
 than RDF to precisely document their meaning as relations, not going
 that direct route would necessitate cumbersome indirection.)
 
 If not, a W3C-sanctioned vocabulary mapping each relation defined at
 [1] would really be the second best. We already have [2] defining a
 subset of these.
 
 A coordinated community effort could also do of course, as long as it
 was stable, durable and gained consensual support.
 
 While I have seen definitions of these relations made by the community
 before (e.g. used directly in AtomOwl, and a complete listing made by
 Ed Summers, which I unfortunately cannot find now), I think we may
 need something more centrally defined for these relations, as close to
 official IANA status as possible. Something from the W3C could be
 close enough. Boiling down to discoverability, consensus and
 stability.
 
 Best regards,
 Niklas
 
 [1]: 
 
http://tools.ietf.org/html/draft-nottingham-http-link-header-09#section-6.2.2

 [2]: http://www.w3.org/1999/xhtml/vocab#
 
 
 
 On Sat, Apr 3, 2010 at 4:07 AM, Danny Ayers danny.ay...@gmail.com wrote:
 Henry, I'm pretty sure you'll have all workings on this - all that's
 needed is a flattened model. I bet it would only take a couple of
 weeks (months) to prepare that in a form that the W3C would accept as
 a Note or something. If you can pull together some of your old stuff,
 I'm happy to draft some text.
 
 It needs doing soon because of the initiatives that hang off Atom are
 getting interesting. Need to be in there from the get-go.
 
 
 
 On 3 April 2010 03:56, Danny Ayers danny.ay...@gmail.com wrote:
 About time to do another rev of that thing? The social xg is having
 another spin, might be a good time to throw it there.
 
 I suspect most folks (yourself there mostly Henry) think this time
 around it should be done minimally..?
 
 On 3 April 2010 01:29, Story Henry henry.st...@bblfish.net wrote:
 On 2 Apr 2010, at 23:53, Nathan wrote:
 
 Hi All,
 
 Any guidance on using predicates in linked data / rdf which do not come
 from rdfs/owl. Specifically I'm considering the range of:
  http://www.iana.org/assignments/relation/*
 
 Ah is that something you found in the AtomOWL spec?
 
 Perhaps we should just give them other names, until the IETF places RDF
 representations
 at those locations, which I imagine could take forever.
 
 Henry
 
 
 such as edit, self, related etc - with additional consideration to the
 thought that these will end up in rdf via RDFa/grddl etc v soon if not
 already.
 
 Any guidance?
 
 Regards,
 
 Nathan
 
 
 
 
 
 
 
 --
 http://danny.ayers.name
 
 
 
 
 --
 http://danny.ayers.name

Re: Using predicates which have no ontology?


Nathan,

 and quote:
 If the relation-type is a relative URI, its base URI MUST be
considered to be http://www.iana.org/assignments/relation/;
 http://tools.ietf.org/id/draft-nottingham-http-link-header-03.txt

Just for the record: the current draft of Web Linking is [1] and the
statement above is not present anymore, in there. However, you find
something alike in Appendix C.

Cheers,
  Michael

[1] http://tools.ietf.org/id/draft-nottingham-http-link-header-09.txt

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Sat, 03 Apr 2010 00:14:16 +0100
 To: Danny Ayers danny.ay...@gmail.com
 Cc: Linked Data community public-lod@w3.org
 Subject: Re: Using predicates which have no ontology?
 Resent-From: Linked Data community public-lod@w3.org
 Resent-Date: Fri, 02 Apr 2010 23:14:54 +
 
 Danny Ayers wrote:
 On 3 April 2010 00:53, Nathan nat...@webr3.org wrote:
 Hi All,
 
 Any guidance on using predicates in linked data / rdf which do not come
 from rdfs/owl. Specifically I'm considering the range of:
  http://www.iana.org/assignments/relation/*
 
 Can't find a URL that resolves there
 
 snap; but that's what rel=edit and so forth resolves to.
 
 see example:
 http://www.w3.org/2001/tag/doc/selfDescribingDocuments.html#ATOMSection
 
 and quote:
 If the relation-type is a relative URI, its base URI MUST be
considered to be http://www.iana.org/assignments/relation/;
 http://tools.ietf.org/id/draft-nottingham-http-link-header-03.txt
 
 obviously all the links defined by:
 http://www.iana.org/assignments/link-relations/link-relations.xhtml
 (from the atom rfc)
 
 such as edit, self, related etc - with additional consideration to the
 thought that these will end up in rdf via RDFa/grddl etc v soon if not
 already.
 
 Any guidance?
 
 By using something as a predicate you are making statements about it. But...
 
 If you can find IANA terms like this, please use them - though beware
 the page isn't the concept. You might have to map them over to your
 own namespace, PURL URIs preferred.
 
 Would it make sense to knock up an ontology for all the standard
 link-relations and sameAs them through to the iana uri's?
 
 Best, Nathan

Re: write enabled web of data / acl/acf/wac etc


 Simply looking for the best place to discuss acl/acf/wac / write enabled
 web of data etc - mailing list or irc or private contacts - unsure if
 this comes under the banner of linked data and thus this mailing list.
  i.e. whilst I can have a good realtime discussion about rest related
 things, coming up short with regards discussing the aforementioned write
 enabled web of data - any pointers?

IMHO definitely here and on #swig IRC channel.

 Further, with regards the ESW wiki pages, I've not seen any
 discussions yet on articles, and with some of the documents I do have
 notes additions etc to add, but don't want to just ad them ad-hoc
 without at least discussing or running past somebody else.

It's a Wiki, so perfectly fine if you edit/comment stuff and the trigger
discussions here and/or IRC.

Great to see write-enabled Linked Data discussions happening again - lot of
work still required till [1] can advance to a stable state ;)


Cheers,
  Michael

[1] http://www.w3.org/DesignIssues/ReadWriteLinkedData.html

-- 
Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730
http://linkeddata.deri.ie/
http://sw-app.org/about.html



 From: Nathan nat...@webr3.org
 Organization: webr3
 Reply-To: nat...@webr3.org
 Date: Sat, 03 Apr 2010 18:16:43 +0100
 To: Linked Data community public-lod@w3.org
 Cc: Michael Hausenblas michael.hausenb...@deri.org
 Subject: write enabled web of data / acl/acf/wac etc
 
 Hi All,
 
 Simply looking for the best place to discuss acl/acf/wac / write enabled
 web of data etc - mailing list or irc or private contacts - unsure if
 this comes under the banner of linked data and thus this mailing list.
  i.e. whilst I can have a good realtime discussion about rest related
 things, coming up short with regards discussing the aforementioned write
 enabled web of data - any pointers?
 
 Further, with regards the ESW wiki pages, I've not seen any
 discussions yet on articles, and with some of the documents I do have
 notes additions etc to add, but don't want to just ad them ad-hoc
 without at least discussing or running past somebody else.
 
 Many Regards,
 
 Nathan

Re: Using predicates which have no ontology?