{
data()->addAttribute(VARIABLE_ID(), ModelAPI_AttributeString::typeId());
data()->addAttribute(EXPRESSION_ID(), ModelAPI_AttributeString::typeId());
+ data()->addAttribute(COMMENT_ID(), ModelAPI_AttributeString::typeId());
data()->addAttribute(EXPRESSION_ERROR_ID(), ModelAPI_AttributeString::typeId());
data()->string(EXPRESSION_ERROR_ID())->setIsArgument(false);