Thanks a lot Rafa.
I now understood the role of Contenthub and how to use same.
The issue with my previous approach was that I was trying to upload
the enhancement rather than the plain text and as a result nothing
was getting uploaded.
I had one more question from SPARQL endpoint of Stanbol can I query
an external RDF graph which is not part of Stanbol.
RDF is visible through an ipaddress:port interface.
Can I make the SPARQL query to this along with the local enhanced graph.
If yes what will be the syntax.
Tried below call
SELECT *
FROM Ipaddress:8080
{ ?s ?p ?o }
LIMIT 10
Call was returning something but did not seem relevant.
How to make this query?
Thanks and Rgds,
Arthi
Hi Arthi,
The Stanbol Contenthub component is an Apache Solr based document
repository, it is not a triple store. It should be use to store
documents with textual content along with RDF metadata. You can find
proper documentation about its usage in [1]. Basically, by default, if
you submit a file(document) to the ContentHub, it will try to enhance it
using the enhancement chain passed by parameter (default chain if the
parameter value is missing), extract the entities and store them along
with the original content in a semantic index in Solr. Besides this, the
resultant enhancement structure (enhancement graph) is stored in a graph
registered in the system (org.apache.stanbol.contenthub.enhancements).
You can then query this graph using the SPARQL endpoint provided by
Stanbol.
I'm not completely sure about it, but I think that If you directly
upload a RDF/XML file to the ContentHub, it is going to try to enhance
it (as normal text) because currently the only format supported for the
content is text/plain. If you need to put together the enhancement
results and some custom metadata in RDF, you can use the metadata
parameter of the REST services of the ContentHub. Take a look to the
REST API at [2]. If you are using Java for your integration, you can see
some examples about how to upload content and enhancements + custom
metadata to the ContentHub in [3].
Hope this helps. Regards
[1] -
http://stanbol.apache.org/docs/trunk/components/contenthub/contenthub5min
[2] - http://dev.iks-project.eu:8081/contenthub/contenthub/store
[3] - https://github.com/zaizi/apache-stanbol-client
El 17/07/13 15:36, arthi.ven...@wipro.com escribió:
> Hi,
> I have a requirement to query the enhancement as done by Stanbol enhancer
> along with
another RDF data ( data store supports SPARQL endpoint)
> I ran the custom enhancer chain from the curl command. I piped the RDF/XML
> output to
a local file.
> I than uploaded this to the content hub.
> When I ran the default SPARQL query from the SPARQL web page I got no results.
> I assumed that once I upload an RDF file into content hub then the query will
> run on
this.
> Is this understanding correct?
> What am I doing wrong here?
>
> If I now need to query across both the data ( the RDF file as well as the
> other RDF endpoint
)
> In the ContentHub if I paste the other RDF URL in the Submit a public
> resource by URL
will the query now happen across both these data.
>
> is there any simple code from which I can run the above case.
>
>
> Sorry for the newbee question. I have read multiple documents but could not
> find a resolution.
>
> Thanks for your help and regards,
> Arthi
>
>
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From: arthi venkataraman (WT01 - CTO Office)
Sent: Wednesday, July 17, 2013 7:47 PM
To: dev@stanbol.apache.org
Subject: RE: Simple example for querying across multiple RDF graphs
Hi ,
Adding I have used the WHERE clause in the SPARQL to point to both the graphs
in the SPARQL query.
However I do not get results.
Is there a way I can directly access any graph from the SPARQL endpoint using
WHERE clause or is there a need to first upload to the ContentHub before the
query
can be run.
Is there any simple Jave code which can be referred for running same.
Thanks and Rgds,
Arthi
From: arthi venkataraman (WT01 - CTO Office)
Sent: Wednesday, July 17, 2013 7:07 PM
To: dev@stanbol.apache.org<mailto:dev@stanbol.apache.org>
Subject: Simple example for querying across multiple RDF graphs
Hi,
I have a requirement to query the enhancement as done by Stanbol enhancer
along with another RDF data ( data store supports SPARQL endpoint)
I ran the custom enhancer chain from the curl command. I piped the RDF/XML
output to a local file.
I than uploaded this to the content hub.
When I ran the default SPARQL query from the SPARQL web page I got no results.
I assumed that once I upload an RDF file into content hub then the query will
run on this.
Is this understanding correct?
What am I doing wrong here?
If I now need to query across both the data ( the RDF file as well as the other
RDF endpoint )
In the ContentHub if I paste the other RDF URL in the Submit a public resource
by URL will the query now happen across both these data.
is there any simple code from which I can run the above case.
Sorry for the newbee question. I have read multiple documents but could not
find a resolution.
Thanks for your help and regards,
Arthi
Please do not print this email unless it is absolutely necessary.
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not the
intended recipient, you should not disseminate, distribute or copy this e-mail.
Please notify the sender immediately and destroy all copies of this message and
any attachments.
WARNING: Computer viruses can be transmitted via email. The recipient should
check this email and any attachments for the presence of viruses. The company
accepts no liability for any damage caused by any virus transmitted by this
email.
www.wipro.com
