const XS_String& value = node->get(attr_name);  if (!value.empty()) _value = value; else _value = def;
	XMLString(const XMLNode* node, const XS_String& attr_name, LPCXSSTR def=XS_TEXT(""))	{		const XS_String& value = node->get(attr_name);		if (!value.empty())			_value = value;		else			_value = def;	}