Function XMLConstHandle

deps/tinyxml2/include/tinyxml2/tinyxml2.h:2116–2117

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

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