[oslc-core] How do I get the shape from a resource?

[Arthur Ryman]

Steve,

The rdf:type should be the OSLC type defined by the appropriate domain 
spec, e.g. CM. It belongs to the OSLC domain, http://open-services.net, so 
GETing it would NOT reflect any new properties added by a service 
provider.

I agree that it would be handy to be able to easily find the shape of a 
resource. There are really two major use cases:

1. Schema-based information, e.g. to design a report. You need to find the 
shape from the service provider. This is what oslc:shape is for.

2. Instance-based information, e.g. you are given the URL of an instance 
resource and you want to find its shape, e.g. to modify the instance via 
PUT. There is no property defined yet. Using oslc:shape might be 
confusing. In XML Schema, they introduced a special namespace for instance 
level information such as type, xsi: 
http://www.w3.org/2001/XMLSchema-instance.

To avoid confusion I suggest we  use a different property, e.g. 
oslc:instanceShape

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:
Steve K Speicher <sspeiche at us.ibm.com>
To:
oslc-core at open-services.net
Date:
04/24/2010 03:06 PM
Subject:
[oslc-core] How do I get the shape from a resource?
Sent by:
oslc-core-bounces at open-services.net



I had assumed that every OSLC defined resource would have an rdf:type 
property that references either the spec defined Type URI OR is it a 
gettable URI that references the service provider's hosted version of the 
resource shape. 

Here's my example, I have a OSLC-CM Change Request resource that looks 
like: 

<oslc_cm:ChangeRequest  rdf:about="http://example.com/bugs/2314"> 
  <rdf:type  rdf:reference="
http://open-services.net/xmlns/cm/2.0#ChangeRequest">       
</oslc_cm:ChangeRequest> 

Is it required for rdf:type to point to the OSLC defined Type URI?   How 
do I get to the resource shape of this resource? 

I would instead think that we'd want an OSLC Common Property called 
"oslc:shape" which points to a gettable OSLC shape resource.  Any 
objections to adding this?  Any need use dc:type here instead (or clarify 
how it could be used) ? 

Thanks,
Steve Speicher | IBM Rational Software | (919) 254-0645
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