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question asked: Oct 07 '15, 3:48 p.m.
question was seen: 1,973 times
last updated: Oct 08 '15, 9:36 a.m.

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Why does RTC work item service provider OSLC request return nested oslc:creationFactory elements?

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Geoff Alexander (196●2●39●48) | asked Oct 07 '15, 3:48 p.m.
edited Oct 07 '15, 3:50 p.m.
The response to an RTC work item service provider OSLC request, such as https://<host>:<port>/ccm/oslc/contexts/_pyf14FrmEeWs66yN_e1diA/workitems/services.xml, contains nested <oslc:creationFactory> elements: 
...
<oslc:creationFactory>
  <oslc:CreationFactory>
    <dcterms:title rdf:parseType="Literal">Location for creation of Task change requests </dcterms:title>
    <oslc:usage rdf:resource="http://open-services.net/ns/cm#task"/>
    <oslc:usage rdf:resource="http://open-services.net/ns/cm#requirementsChangeRequest"/>
    <oslc:resourceType rdf:resource="http://open-services.net/ns/cm#ChangeRequest"/>
    <oslc:resourceType rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/types/_pyf14FrmEeWs66yN_e1diA/task"/>
    <oslc:resourceShape rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/context/_pyf14FrmEeWs66yN_e1diA/shapes/workitems/task"/>
    <oslc:creation rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/contexts/_pyf14FrmEeWs66yN_e1diA/workitems/task"/>
  </oslc:CreationFactory>
</oslc:creationFactory>
<oslc:creationFactory>
  <oslc:CreationFactory>
    <dcterms:title rdf:parseType="Literal">Location for creation of Story change requests </dcterms:title>
    <oslc:usage rdf:resource="http://open-services.net/ns/cm#planItem"/>
    <oslc:resourceType rdf:resource="http://open-services.net/ns/cm#ChangeRequest"/>
    <oslc:resourceType rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/types/_pyf14FrmEeWs66yN_e1diA/com.ibm.team.apt.workItemType.story"/>
    <oslc:resourceShape rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/context/_pyf14FrmEeWs66yN_e1diA/shapes/workitems/com.ibm.team.apt.workItemType.story"/>
    <oslc:creation rdf:resource="https://sport6.rtp.raleigh.ibm.com:9463/ccm/oslc/contexts/_pyf14FrmEeWs66yN_e1diA/workitems/com.ibm.team.apt.workItemType.story"/>
  </oslc:CreationFactory>
</oslc:creationFactory>
...
From what I find at OSLC Core Specification Version 2.0 - Resource: Creation Factory, the <oslc:creationFactory> element isn't allowed to contain a nested <oslc:creationFactory> element.  So I would think that RTC OSLC response isn't valid.  Is my understanding correct?  Is this an RTC OSLC defect?

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Donald Nong (14.5k●4●14) | answered Oct 08 '15, 1:19 a.m.
edited Oct 08 '15, 1:21 a.m.
The result that you got looks a bit strange. It should've looked like
< oslc:creationFactory>
< oslc:CreationFactory>
......
I know that Lyo OSLC4J works with the service provide document just fine, so it should be correct. QM and RM return something similar (re: nested).

If you look at the "Resource: Service" table in the specification, there two elements are not the same thing. Note that "queryCapability" has the same "nestedness".
Prefixed Name Occurs Read-only Value-type Represen-tation Range Description
oslc:domain exactly-one True Resource Reference n/a Namespace URI of the specification that is implemented by this service. In most cases this namespace URI will be for an OSLC domain, but other URIs MAY be used.
oslc:creationFactory zero-or-many True Local Resource n/a oslc:CreationFactory Enables clients to create new resources
oslc:queryCapability zero-or-many True Local Resource n/a oslc:QueryCapability Enables clients query across a collection of resources
oslc:selectionDialog zero-or-many True Local Resource n/a oslc:Dialog Enables clients to select a resource via UI
oslc:creationDialog zero-or-many True Local Resource n/a oslc:Dialog Enables clients to create a resource via UI
oslc:usage zero-or-many True Resource Resource n/a An identifier URI for the domain specified usage of this service. If a service provider has multiple services, it may designate the primary or default one that should be used with a property value of http://open-services.net/ns/core#default

Geoff Alexander selected this answer as the correct answer
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Geoff Alexander commented Oct 08 '15, 9:35 a.m. | edited Oct 08 '15, 9:36 a.m.

Donald, thanks for the response.

I realize the there was a capitalization problem in the example XML I posted.  I did a copy/paste of the XML, but for some reason all of the element tags (text between < and >) were converted to lower case. 

I still think nesting oslc:CreationFactory in a oslc:creationFactory looks strange, but I no longer think it's the cause of my Lyo OSLC4J problem.

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