BuildableParser 
    class BuildableParser(val gtkBuildableParserPointer: <Error class: unknown class><<Error class: unknown class>>)(source)
A sub-parser for GtkBuildable implementations.
Skipped during bindings generation
- field - start_element: Fields with callbacks are not supported
- field - end_element: Fields with callbacks are not supported
- field - text: Fields with callbacks are not supported
- field - error: Fields with callbacks are not supported