* @see eu.planets_project.tb.api.model.ontology.OntologyProperty#getDataType()
*/
public String getDataType() {
if(dataType==null){
//rdf property datatype: http://planetarium.hki.uni-koeln.de/public/XCL/ontology/XCLOntology.owl#Datatype
RDFProperty propertyDatatype = individual.getOWLModel()
.getRDFProperty(this.xclOntologyLocation+"#Datatype");
//System.out.println("<Prop name: "+datatype.getBrowserText() +" value: "+individual.getPropertyValue(datatype));
Object oDatatype = individual.getPropertyValue(propertyDatatype);
if(oDatatype instanceof DefaultOWLIndividual){
DefaultOWLIndividual ddatatype = (DefaultOWLIndividual)individual.getPropertyValue(propertyDatatype);