Utility functions @doc: @Returns: @utf8_text: @Returns: @text: @Returns: @text: @truncation_length: @Returns: @Returns: @stylesheet_relative_path: @Returns: @icon_basename: @Returns: @string: @to_add: @string: @to_add: @toplevel_window: @gpc: @xml_doc: @msg: @str: @xml_doc: @root_element: @ExternalID: @SystemID: @Returns: @xml_doc: @root_element: @ExternalID: @SystemID: @Returns: @doc: @parent_window: @w: @col: @x0: @y0: @x1: @xml_ns1: @xml_ns2: @Returns: @uri0: @uri1: @Returns: @uri0: @uri1: @Returns: @source_mime_type: @output_text_view: @Returns: @doc: @source_mime_type: @regeneration_cb: @Returns: @value0: @value1: @Returns: @ns_uri: @local_name: @Returns: @element_desc: @Returns: @element_desc: @element_desc: @doc: @ns_search_node: @Returns: @element_desc: @doc: @Returns: @element_desc: @ds: @Returns: @element_desc: @ds: @Returns: @list_of_element_desc: @title: @description: @doc: @elements: @Returns: @label: @tip: @pixbuf: @Returns: @stock_id: @Returns: @primary_window: @parent_ui_path: @namespace: @local_attribute_name: @Returns: @content: @title: @name: @mime_type: @Returns: