Hello Parham,
The RmSpecificationV2Shapes page to which you refer is in error. I've
fixed this page so that each oslc:Property has exactly one oslc:valueType,
as required. (I created an entry in the issue page at [1].)
On your other point concerning expressing the Ecore model in RDF. In
general, this is not possible since Ecore and RDF have different
expressive powers. The additional meaning that OSLC Resource Shape brings
(in addition to RDF) is not adequate either, as your example illustrates.
best wishes,
-ian
[1] http://open-services.net/bin/view/Main/RmSpecificationV2Issues
[email protected] (Ian Green1/UK/IBM@IBMGB)
Chief Software Architect, Requirements Definition and Management
IBM Rational
From:
"Vasaiely, Parham" <[email protected]>
To:
<[email protected]>
Date:
26/10/2011 17:17
Subject:
[oslc-core] Using OSLC Resource Shapes
Sent by:
[email protected]
Hi all,
We are trying to implement OSCL in an existing project by defining first
ResourceShapes to represent an existing MetaModel (Ecore).
We are facing now the following problem:
1)
By trying to specify a property for a Resource with multiple possible
types (oslc:range) the ResourceShape Spec. denies the specification of
multiple Shapes for the resource. However, since our property can have the
type FormalAssertion and InformalAssertion it should provide different
shapes. Is our statement correct?
<oslc:Property>
<oslc:name>weakAssumption</oslc:name>
<oslc:propertyDefinition rdf:resource="
http://www.sample.eu/rtp/2.0/CMM/OSLC/attributeDefinitions/weakAssumption";
/>
<dcterms:title
rdf:parseType="Literal">weakAssumption</dcterms:title>
<dcterms:description
rdf:parseType="Literal">CMM.Requirements.SystemRequirement.weakAssumption</dcterms:description>
<oslc:representation rdf:resource="
http://open-services.net/ns/core#Reference"; />
<oslc:valueType rdf:resource="
http://open-services.net/ns/core#Resource"; />
<oslc:valueShape rdf:resource="
http://www.sample.eu/rtp/2.0/CMM/OSLC/shapes/Assertion"; />
<oslc:range rdf:resource="
http://www.sample.eu/rtp/2.0/CMM/OSLC/types/FormalAssertion"; />
<oslc:range rdf:resource="
http://www.sample.eu/rtp/2.0/CMM/OSLC/types/InformalAssertion"; />
<oslc:occurs rdf:resource="
http://open-service.net/ns/core#Zero-or-many"; />
</oslc:Property>
</oslc:property>
2)
In the example shape provided by at
http://open-services.net/bin/view/Main/RmSpecificationV2Shapes one can see
that the property description has two value-types. However the shape spec.
is defining that a property must have exactly one value-type. But the core
also allows multiple types for a property as you can see in the part
“Defining OSLC Properties: Value-types: A property MAY allow multiple
value-types and a value MUST satisfy one of them…”
Is there something we have missed in the specification?
Can we specify a property shape like the one below?
<oslc:property>
<oslc:Property>
<oslc:name>description</oslc:name>
<oslc:propertyDefinition rdf:resource="
http://purl.org/dc/terms/description"; />
<dcterms:title
rdf:parseType="Literal">Description
</dcterms:title>
<dcterms:description
rdf:parseType="Literal">CMM.NamedElement.comment</dcterms:description>
<!-- Use XMLLiteral String Representation
-->
<oslc:valueType rdf:resource="
http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral"; />
<!-- Zero-or-one defined by RMv2Spec -->
<oslc:occurs rdf:resource="
http://open-service.net/ns/core#Zero-or-many"; />
</oslc:Property>
</oslc:property>
Many thanks!
Kind Regards,
Parham Vasaiely
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