// empty expression -> return null pointer
if(in_sExpression.length() == 0)
return null;
try{
OCLExpression oExpression = null;
OCL oOcl = org.eclipse.ocl.uml.OCL.newInstance(
new UMLEnvironmentFactory(
new ResourceSetImpl()));
OCL.Helper helper = oOcl.createOCLHelper();
//if(in_sExpressionType.compareTo(Configuration.getOCLInvId()) == 0)