GstXML Convert Elements into an XML presentation. All GstElements can be serialized to an XML presentation and subsequently loaded back. @Returns: @xml: @doc: @root: @Returns: @xml: @buffer: @size: @root: @Returns: @xml: @fname: @root: @Returns: @element: @Returns: @element: @out: @Returns: @xml: @name: @Returns: @xml: @Returns: @cur: @parent: @Returns: