module documentation

Transforms needed by most or all documents:

Class Decorations Populate a document's decoration element (header, footer).
Class ExposeInternals Expose internal attributes if expose_internals setting is set.
Class FilterMessages Remove system messages below verbosity threshold.
Class Messages Place any system messages generated after parsing into a dedicated section of the document.
Class SmartQuotes Replace ASCII quotation marks with typographic form.
Class StripClassesAndElements Remove from the document tree all elements with classes in self.document.settings.strip_elements_with_classes and all "classes" attribute values in self.document.settings.strip_classes.
Class StripComments Remove comment elements from the document tree (only if the strip_comments setting is enabled).
Class TestMessages Append all post-parse system messages to the end of the document.