ex1:FullProfessor  rdf:subClassOf  ex1:Professor.
ex1:AssistantProfessor  rdf:subClassOf  ex1:Professor.
ex1:Professor  owl:equivalentClass  ex2:Teacher

ex1:Bob  rdf:type  ex1:FullProfessor .
ex1:Alice  rdf:type  ex1:AssistantProfessor .
ex2:Mary  rdf:type  ex2:Teacher

SELECT ?x
 WHERE {
 ?x rdf:type ex1:Professor
 }

<titles>{
for $book in collection("books")/book where $book/year="1990"
return $book/title
}</titles>

update delete collection("books")/book/isbn

select
   id, vol, xmlquery('$j/name', passing journal as "j") as name
from
   journals
where
   xmlexists('$j[licence="CreativeCommons"]', passing journal as "j")

XQDataSource xqs = new ExistXQDataSource();
XQDataSource xqs = new SednaXQDataSource();
xqs.setProperty("serverName", "localhost");
XQConnection conn = xqs.getConnection();
XQExpression xqe = conn.createExpression();
String xqueryString =  "for $x in doc('books.xml')//book return $x/title/text()";
XQResultSequence rs = xqe.executeQuery(xqueryString);
while(rs.next())
  System.out.println(rs.getItemAsString(null));
conn.close();