/**
  * @see parser.IDLParserVisitor#visit(ASTvalue, Object)
  * @param data the buildino of the container for this valuetype
  */
 public Object visit(ASTvalue node, Object data) {
     // <value> ::= <value_decl> | <value_abs_decl> | <value_box_dcl> | <value_forward_dcl>
     node.childrenAccept(this, data);
     return null;
 }