code: def register():
      
      registry = {
          key: bake_html(key)
          for key in ('css', 'css-all', 'tag', 'text')
      }
      registry['xpath'] = bake_parametrized(xpath_selector, select_all=False)
      registry['xpath-all'] = bake_parametrized(xpath_selector, select_all=True)
      return registry
docs: Return dictionary of tranform factories