Domainmodel: entities+=Entity* ;

Entity:
'ENTITY' name=ID 'END_ENTITY';

@Check
public void checkNoJack(Entity e){
   if (e.getName().equals("Jack")){
      error("This name is not valid.",null);
   }
}

ENTITY Jack END_ENTITY

@Test
def void example() throws Exception{
   parserHelper.parse("ENTITY Jack END_ENTITY")
}

@Test
def void example() throws Exception{
   parserHelper.parse("CAUSALWORD Jack OTHER_CASUAL")
}

.parse.assertNoErrors