[oslc-core] Example of a self-subject query capability representation?

[Arthur Ryman]

Dave,

The example query response in the core spec is a mult-subject response 
since it begins with <rdf:RDF>.

A "container" resource or a "collection" resource is a plain old resource 
that has some multi-valued property that we regard as a membership 
property. The values of this property are the members of the 
container/collection/list/... We can filter, sort, etc. this set of 
members using "member list pattern" queries.

The core spec links to examples of self-subject query responses [1]. For 
example, the resource  http://braintwistors.example.com/ems10/Project is a 
container resource that contains the list of all project resources. It has 
a multi-valued property ems:memberProject that refers to the member 
projects.

<ems:ProjectList xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dc="http://purl.org/dc/terms/" xmlns:ems="
http://open-services.net/software-metrics/"
   rdf:about="http://braintwistors.example.com/ems10/Project">
   <dc:title>BrainTwistors Corp. Project List</dc:title>
   <dc:description>
      This is the list of all Project resources contained in
      BrainTwistors Corp. MetricServer web application.
      </dc:description>
   <ems:service rdf:resource="http://braintwistors.example.com/ems10" />

   <ems:memberProject rdf:resource="
http://braintwistors.example.com/ems10/Project/2009" />
   <ems:memberProject rdf:resource="
http://braintwistors.example.com/ems10/Project/3707" />
   <ems:memberProject rdf:resource="
http://braintwistors.example.com/ems10/Project/3998" />
   <!--
      Other members of this ProjectList resource have been omitted for
      brevity.
   -->
</ems:ProjectList> 

The following query filters the project list:

http://braintwistors.example.com/ems10/Project?oslc.where=dc:identifier=
"2009" 

The query response is:

<ems:ProjectList xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dc="http://purl.org/dc/terms/" xmlns:ems="
http://open-services.net/software-metrics/"
   rdf:about="http://braintwistors.example.com/ems10/Project">
   <ems:memberProject rdf:resource="
http://braintwistors.example.com/ems10/Project/2009" />
</ems:ProjectList> 

[1] 
http://open-services.net/bin/view/Main/OslcSimpleQuerySemanticsV1#Examples
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
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From:
Dave <snoopdave at gmail.com>
To:
oslc-core <oslc-core at open-services.net>
Date:
04/26/2010 12:45 PM
Subject:
[oslc-core] Example of a self-subject query capability  representation?
Sent by:
oslc-core-bounces at open-services.net



I need a little help understanding the most recent changes in the
Query Capabilities section of the spec. We now have two types of query
capabilities, multi-subject and self-subject but we only illustrate
multi-subject queries in our examples. I'm trying to understand what a
self-subject query response would look like. Here's how it is
described in the Core spec:

"The RDF/XML representation of the query result begins with a node
element whose rdf:about attribute value is equal to the base URI.
Typically, the base URI is a container resource that may have a long
list of members, e.g. the list of all defects in a bug tracking
system. Since the list may contains hundreds of thousands of members,
queries are used to filter the list for members that satisfy certain
conditions, e.g. the bugs that have high priority and were created
this week."

I don't know what "the base URI is a container resource that may have
a long list of members" means. Are we using a multi-valued property
here to hold the resources that match the query? Tack or Arthur, would
one of you please provide a simple example of a self-subject query
response?

Thanks,
- Dave

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