GstXml Convert Elements into an XML presentation. All GstElements can be serialized to an XML presentation and subsequently loaded back. @object: @topelements: @ns: @Returns: @xml: @doc: @root: @Returns: @xml: @buffer: @size: @root: @Returns: @xml: @fname: @root: @Returns: @element: @Returns: @xml: @name: @Returns: @xml: @Returns: @gstxml: the object which received the signal. @arg1: @arg2: @gstxml: the object which received the signal. @arg1: @arg2: