Function XMLConstHandle

3rdparty/tinyxml2/tinyxml2.h:2143–2144

    explicit XMLConstHandle( const XMLNode& node ) : _node( &node ) {
    }
    XMLConstHandle( const XMLConstHandle& ref ) : _node( ref._node ) {
    }

    XMLConstHandle& operator=( const XMLConstHandle& ref )							{
        _node = ref._node;