ontology.sql

./stardog query --reasoning foafDB "PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
 SELECT ?name
 WHERE {
     ?person foaf:name ?name .
 }
 "

# example: A part from a owl / rdf
   <rdf:Description rdf:about="http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf#dj">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
        <s:seeAlso rdf:resource="http://www.grorg.org/dean/foaf.rdf"/>
        <foaf:homepage rdf:resource="http://www.grorg.org/dean/"/>
        <foaf:mbox rdf:resource="mailto:dean@w3.org"/>
        <foaf:mbox rdf:resource="mailto:dino@grorg.org"/>
        <foaf:mbox_sha1sum>6de4ff27ef927b9ba21ccc88257e41a2d7e7d293</foaf:mbox_sha1sum>
        <foaf:name>Dean Jackson</foaf:name>
    </rdf:Description>
    
    Here the "<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>" says the subject of that rdf piece is person.
   
    foaf:name in the query will search for all the predicates of the form "<foaf:name>Dean Jackson</foaf:name>". 
    And the ?name part in the query will extract the value.