[oslc-core] Resources from a different service
Arthur Ryman
ryman at ca.ibm.com
Thu Oct 21 09:00:24 EDT 2010
Dragos,
The ResourceShape resources describe the data model of the resources, not
the contents of a data source. All you can assume is that if you GET a
resource you'll receive an representation of it, If you use the Simple
Query syntax, you'll receive as much data as the service can provide, but
that may not include all the data you requested, i.e. you may have to
explicitly GET resources that are linked.
We don't have a way to specify the precise contents of the data source. A
resource may link to other resources in the same service or those in
remote services.
This situation improves when the data from multiple sources is aggregated
in a triple store and your can use SPARQL to query it.
Regards,
___________________________________________________________________________
Arthur Ryman, PhD, DE
Chief Architect, Project and Portfolio Management
IBM Software, Rational
Markham, ON, Canada | Office: 905-413-3077, Cell: 416-939-5063
From:
Dragos Cojocari <dragos.cojocari at ro.ibm.com>
To:
oslc-core at open-services.net
Date:
10/21/2010 06:25 AM
Subject:
[oslc-core] Resources from a different service
Sent by:
oslc-core-bounces at open-services.net
Hey all,
as resources exposed by one provider can be linked to resources from
another provider some questions arise on how they can be retrieved:
1. can the Resource Shape for a resource refer the resource shapes of the
resources of the other domains in the oslc:valueShape property?
2. if the answer to (1) is yes, and there is no obvious reason why it
shouldn't be, can one query service aggregate resources from multiple
providers?
I believe the answer to (2) is NO and in this case a different question
arises: how can a query consumer determine what resources can be obtained
( aggregated/in-lined) from one query service? in other words, how can the
consumer determine how to build the queries to retrieve the data:
- referenced resources from the same domain could be obtained with
a single query crafted to in-line the properties of the referenced
resources
- referenced resources from other providers would have to be
requested using multiple queries sent to multiple query services.
Example:
- single provider: the details of a "QM V2 TestPlan" and its "QM V2
TestCases" linked by http://open-services.net/ns/qm#usesTestCase ( as
described by
http://open-services.net/bin/view/Main/QmSpecificationV2Shapes)
- multiple provider: the details of a "CM V2 Change Request" and the
details of the "QM V2 Test Case" linked through
http://open-services.net/ns/cm#testedByTestCase ( as described by
http://open-services.net/bin/view/Main/CmSpecificationV2Shapes )
In the above examples the consumer needs to know that the details for the
"QM V2 Test Case" cannot be obtained from the same query service as the
"CM V2 Change Request".
Thanks and regards,
Dragos
Exceptand situatiile in care partile au convenit in alt mod: / Unless
stated otherwise above:
IBM România S.R.L.
Bucharest Business Park, Corp A2, Şos. Bucureşti-Ploieşti Nr. 1A, 013681
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