Move component_manager to a separated object. - component_manager is a mixin for domview. - domview inherit component_manager to mixing-in component_manager. - There is no boundary between component_manager and domview, hard to be managed and reused. - component_manager is a separated object that hold a reference to corresponding domview. - domview delegate attribute accessing to component_manager object to expose attributes and methods of component_manager. (__getattr__()) - component_manager is still a mix-in of domview.

import pybExtension

class html5css3_ext(pybExtension.PYBindExtImp):
    def save(self, module, doc, filename):
        print 'save to ' + filename
        pass
    pass

extension = (html5css3_ext(),
             'net.scribboo.html5css3',
             'HTML5/CSS3 exporter',
             'output',
             {'extension': '.html',
              'mimetype': 'text/html',
              '_filetypename': 'HTML5/CSS3 (*.html)'})