for(Object o: exp){
ac.addOperand((RDFSClass)convertSetValue(o));
}
obj = ac;
}else if(exp.getExpressionType() == ILogicExpression.OR){
OWLUnionClass oc = model.createOWLUnionClass();
for(Object o: exp){
oc.addOperand((RDFSClass)convertSetValue(o));
}
obj = oc;
}
return obj;
}else if(value instanceof Collection){