code: def parse_value_object(self, tup_tree):
          
  
          self.check_node(tup_tree, 'VALUE.OBJECT')
  
          child = self.one_child(tup_tree, ('CLASS', 'INSTANCE'))
  
          return (name(tup_tree), attrs(tup_tree), child)
docs: ::
  
              <!ELEMENT VALUE.OBJECT (CLASS | INSTANCE)>