9. The system of claim 8 , wherein the machine-readable program code further includes: instructions for providing an ontology table function for expressing combined queries of the given relational database and the ontology relational database; instructions for receiving semantic queries expressed according to the ontology table function; and instructions for translating the received semantic queries into a search query having SQL/XML search operators supported by the DBMS.
9. The system of claim 8 , wherein the machine-readable program code further includes: instructions for providing an ontology table function for expressing combined queries of the given relational database and the ontology relational database; instructions for receiving semantic queries expressed according to the ontology table function; and instructions for translating the received semantic queries into a search query having SQL/XML search operators supported by the DBMS. 10. The system of claim 9 , wherein the machine-readable program code instructions for the translating instructs the translating to form the search query of SQL SELECT and WHERE operators and of at least one XML search operator.