XMLString(const XMLNode* node, const XS_String& attr_name, LPCXSSTR def=XS_TEXT(""))
XMLString(const XS_String& value) :	_value(value)
	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;	}