Hi Bill
Thanks for that - particularly confirming that dissemination executions work
even when the content model object doesn't assert its own content model
correctly.
I wonder if we should add some kind of validation for this - particularly as
there could be an expectation that one should be able to run these sorts of
queries to determine what content models exist. Or whether we we should (in
a similar manner to the "default" object content model) behind-the-scenes
create this triple identifying the default content model for content model
objects.
So general questions for the list:
(a) when ingesting content model objects, should we enforce a RELS-EXT
assertion to a valid content model for content model objects? or
(b) should we create a Resource Index triple identifying the
fedora-system:ContentModel-3.0 as a default for content model objects when
none is specified in RELS-EXT?
(c) should we stop CMA features working (eg the dissemination execution) if
the object identified as the content model does not itself identify through
RELS-EXT that it is a content model object?
Or.... (d) do nothing!
(I think there are probably issues at least with a and b - how do we tell
that an object is a content model object? Surely the RELS-EXT assertion is
the way to do that, but the scenario is one where this assertion is not
present.)
Regards
Steve
-----Original Message-----
From: Bill Parod [mailto:bill-pa...@northwestern.edu]
Sent: 28 October 2010 15:56
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Cmodel discovery?
Steve,
On Oct 28, 2010, at 3:09 AM, Steve Bayliss wrote:
All Content Model objects *should* contain the triple that Adam has
identified, the triple isn't generated automatically (however if an object
declares no content model, then a triple will be generated identifying the
"default" content model - info:fedora/fedora-system:FedoraObject-3.0).
Thanks very much for confirming the use of <fedora-model:hasModel
rdf:resource="info:fedora/fedora-system:ContentModel-3.0"/> as convention.
Some of our cmodels do not assert it, so I will update them to do so.
I'm not sure if the CMA works correctly if a Content Model object fails to
declare that triple, perhaps that's what is going on in this case? It would
be useful to confirm if (a) the RELS-EXT of the CModel objects do indeed
fail to declare that triple and (b) if any objects belonging to that CModel
"work" correctly wrt object methods etc.
Yes, they do work, at least as regards CMA binding for dissemination
execution.
If you want to query for content models *in use* by objects in the
repository, you could use the query
select $o
from <#ri>
where $s <info:fedora/fedora-system:def/model#hasModel> $o
and use the "Force Distinct" option in the risearch web interface (or the
distinct=on query parameter if calling the risearch service directly).
That's what I'm doing now, though since your confirmation that cmodel
objects should assert <fedora-model:hasModel
rdf:resource="info:fedora/fedora-system:ContentModel-3.0"/>, I'll update all
our cmodels to do so. I'm then inclined to use Adam's original query
suggestion as it seems more efficient:
select $cmodel
from <#ri>
where $cmodel <fedora-model:hasModel>
"info:fedora/fedora-system:ContentModel-3.0"
Thanks very much,
- Bill
Steve
-----Original Message-----
From: aj...@virginia.edu [mailto:aj...@virginia.edu]
Sent: 22 October 2010 16:10
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Cmodel discovery?
Bill--
Perhaps we're seeing CModels created by different means
ending up with different RELS-EXT contents. I'm seeing that
triple in all of our CModels, but because some of them were
taken from external sources (e.g. a JPEG2000 CModel from the
LANL Djatoka project) I don't know whether this triple is
normatively produced or is just a matter of convention.
Perhaps one of the Fedora developers can speak to this?
---
A. Soroka
Digital Research and Scholarship R & D
the University of Virginia Library
On Oct 22, 2010, at 10:59 AM, Bill Parod wrote:
Hi Adam,
I tried it (with slightly different syntax):
select $cmodel
from <#ri>
where $cmodel <fedora-model:hasModel>
<info:fedora/fedora-system:ContentModel-3.0>
and found some of our cmodels but not all, which leads me
to think that you've not only provided a query solution but
revealed something some of our cmodels RELS-EXT are lacking:
<fedora-model:hasModel
rdf:resource="info:fedora/fedora-system:ContentModel-3.0"/>
Is that indeed the convention?
Thanks much!
Bill
On Oct 22, 2010, at 9:40 AM, aj...@virginia.edu wrote:
Bill--
If I'm not mistaken, you'll find an RDF statement:
<fedora-model:hasModel
rdf:resource="info:fedora/fedora-system:ContentModel-3.0"/>
in every cModel object. Might that be a query that can do
the job? Something like:
select $cmodel
from <#ri>
where $cmodel <fedora-model:hasModel>
"info:fedora/fedora-system:ContentModel-3.0"
---
A. Soroka
Digital Research and Scholarship R & D
the University of Virginia Library
On Oct 22, 2010, at 10:34 AM, Bill Parod wrote:
I'm working on a repository introspection service that
provides a repository profile from the point of view of
cmodels and services. The motivation is to obtain a concise
picture of what's in the repository, provide export tools to
aid in selective migration, and to generate model/service
documentation from the models and services themselves.
My question is this: Is there a way, using Fedora REST
APIs or triple store queries to obtain a list of the pids of
cmodel objects in the repository?
I'm currently using the triple store to query for cmodel
/ service pairings:
select $cmodel $service
from <#ri>
where $cmodel <fedora-model:hasService> $service
But that will only find cmodels that have associated
services. Ours tend to fall into that category but I'd like
to do it in a way that is more general. I'm not very
experienced with using the tripe store, so I'm hoping there's
a way there to do this, though that seems doubtful from what
I'm seeing in cmodel RELS-EXT.
I know I can do a sql query on the database ( select
distinct cModel from modelDeploymentMap) , but I'd of course
like to avoid cutting in at that level, and I'm not sure
cmodels without services are represented there anyway.
Is there a way to discover cmodels using the APIs or the
triple store? Or is it best to put something specific in
cmodel RELS-EXT for that purpose? That's what I'm about to
do, but thought I'd ask first.
Thanks,
Bill
Bill Parod
Library Technology Division - Enterprise Systems
Northwestern University Library
bill-pa...@northwestern.edu
847 491 5368
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Nokia and AT&T present the 2010 Calling All
Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in
U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices,
nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and
Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
_______________________________________________
Fedora-commons-users mailing list
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Bill Parod
Library Technology Division - Enterprise Systems
Northwestern University Library
bill-pa...@northwestern.edu
847 491 5368
--------------------------------------------------------------
----------------
Nokia and AT&T present the 2010 Calling All
Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in
U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly
$6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish
to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev_____________________________
__________________
Fedora-commons-users mailing list
Fedora-commons-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/fedora-commons-users
----------------------------------------------------------------------------
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Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
_______________________________________________
Fedora-commons-users mailing list
Fedora-commons-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/fedora-commons-users
----------------------------------------------------------------------------
--
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
_______________________________________________
Fedora-commons-users mailing list
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Bill Parod
Library Technology Division - Enterprise Systems
Northwestern University Library
bill-pa...@northwestern.edu
847 491 5368
------------------------------------------------------------------------------
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
_______________________________________________
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