For us, being a Collection is a matter of subscribing to a Content 
Model (because Collections have specific behaviors), but being a 
member of a Collection is a relationship:

<foxml:datastream ID="RELS-EXT" CONTROL_GROUP="X" STATE="A" VERSIONABLE="true">
   <foxml:datastreamVersion 
FORMAT_URI="info:fedora/fedora-system:FedoraRELSExt-1.0"
     ID="RELS-EXT.0" MIMETYPE="application/rdf+xml" LABEL="relationships">
     <foxml:contentDigest DIGEST="none" TYPE="DISABLED"/>
     <foxml:xmlContent>
       <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
         xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
         xmlns:fedora="info:fedora/fedora-system:def/relations-external#">
         <rdf:Description rdf:about="info:fedora/nls:101">
           <fedora:hasModel rdf:resource="info:fedora/nls:CModelCollection"/>
           <fedora:isMemberOfCollection rdf:resource="info:fedora/nls:100"/>
         </rdf:Description>
       </rdf:RDF>
     </foxml:xmlContent>
   </foxml:datastreamVersion>
</foxml:datastream>


At 4:08 PM +0100 8/6/10, Hamilton, Gill wrote:
Content-type: multipart/alternative;
  boundary="Boundary_(ID_bhogWx8O8TxvL6PP06otMA)"
Content-class: urn:content-classes:message

I promise Š last question of the week Š..

Is this allowed, specifically for an object to be both a collection 
and a member of another collection?  Fedora didn't seem to object so 
I'm guessing but ŠŠ why is "isCollection" not part of the RELS-EXT 
ontology or am I just being dim (don't all answer that at once ;-)

My references were:
<http://fedora-commons.org/definitions/1/0/fedora-relsext-ontology.rdfs>http://fedora-commons.org/definitions/1/0/fedora-relsext-ontology.rdfs
<https://wiki.duraspace.org/pages/viewpage.action?pageId=17530955>https://wiki.duraspace.org/pages/viewpage.action?pageId=17530955

Have a good weekend everyone
Gill

     <foxml:datastream ID="RELS-EXT" CONTROL_GROUP="X" STATE="A" 
VERSIONABLE="true">
         <foxml:datastreamVersion 
FORMAT_URI="info:fedora/fedora-system:FedoraRELSExt-1.0"
             ID="RELS-EXT.0" MIMETYPE="application/rdf+xml" 
LABEL="relationships">
             <foxml:contentDigest DIGEST="none" TYPE="DISABLED"/>
             <foxml:xmlContent>
                 <rdf:RDF 
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
                     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
 
xmlns:fedora="info:fedora/fedora-system:def/relations-external#">
                     <rdf:Description rdf:about="info:fedora/nls:101">
                         <fedora:isCollection>true</fedora:isCollection>
                         <fedora:isMemberOfCollection 
rdf:resource="info:fedora/nls:100"/>
                     </rdf:Description>
                 </rdf:RDF>
             </foxml:xmlContent>
         </foxml:datastreamVersion>
     </foxml:datastream>
---------------------------------------------------
Gill Hamilton
Systems Librarian
National Library of Scotland
George IV Bridge
Edinburgh EH1 1EW
Scotland, UK

e: <mailto:[email protected]>[email protected]
skype: gill.hamilton.nls
t: +44 (0)131-623 3769
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