[Rdfapi-php-interest] properties with SPARQL

Hello,

A SPARQL-Newby needs an SPARQL-Expert ;-)

maybe its not the right list, but I thought, that maybe someone here  
knows an answer..

Following problem:
This is my Example-Ontologie:


<?xml version="1.0"?>
<rdf:RDF xmlns="http://www.vernetzte-kirche.de/demo#"
      xml:base="http://www.vernetzte-kirche.de/demo"
      xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
      xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:owl="http://www.w3.org/2002/07/owl#">
     <owl:Ontology rdf:about=""/>
     <owl:ObjectProperty rdf:ID="belongsToPartnerOrganization">
         <rdfs:domain rdf:resource="#ProjectWorker"/>
         <rdfs:range rdf:resource="#PartnerOrganization"/>
     </owl:ObjectProperty>
     <owl:DatatypeProperty rdf:ID="birthdate">
         <rdfs:domain rdf:resource="#ProjectWorker"/>
         <rdfs:range rdf:resource="http://www.w3.org/2001/ 
XMLSchema#date"/>
     </owl:DatatypeProperty>
     <owl:ObjectProperty rdf:ID="chief">
         <rdf:type rdf:resource="http://www.w3.org/2002/07/ 
owl#FunctionalProperty"/>
         <rdfs:domain rdf:resource="#PartnerOrganization"/>
         <rdfs:range rdf:resource="#ProjectWorker"/>
         <rdfs:comment xml:lang="en"
             >Here I can write more Text
another line
And one more line</rdfs:comment>
     </owl:ObjectProperty>
     <owl:DatatypeProperty rdf:ID="longStringdescription">
         <rdfs:domain>
             <owl:Class>
                 <owl:unionOf rdf:parseType="Collection">
                     <owl:Class rdf:about="#PartnerOrganization"/>
                     <owl:Class rdf:about="#ProjectWorker"/>
                 </owl:unionOf>
             </owl:Class>
         </rdfs:domain>
         <rdfs:range rdf:resource="http://www.w3.org/2001/ 
XMLSchema#string"/>
     </owl:DatatypeProperty>
     <owl:Class rdf:ID="PartnerOrganization"/>
     <owl:Class rdf:ID="ProjectWorker"/>
     <owl:DatatypeProperty rdf:ID="realname">
         <rdfs:domain>
             <owl:Class>
                 <owl:unionOf rdf:parseType="Collection">
                     <owl:Class rdf:about="#PartnerOrganization"/>
                     <owl:Class rdf:about="#ProjectWorker"/>
                 </owl:unionOf>
             </owl:Class>
         </rdfs:domain>
         <rdfs:range rdf:resource="http://www.w3.org/2001/ 
XMLSchema#string"/>
     </owl:DatatypeProperty>
</rdf:RDF>


Now I want to get the Properties for the Class ProjectWorker with  
SPARQL.
Is it possible?

When I just use:

SELECT  ?prop ?pred ?obj
WHERE { ?prop rdfs:domain <http://www.vernetzte-kirche.de/ 
demo#ProjectWorker> .
?prop ?pred ?obj
}

I only get the properties birthdate and belongsToPartnerOrganization,  
which don't belong to the Collection.
Is it possible to find all 4 Properties in 1 Query??

Any hints are welcome
Miklos