A mapping of element names to mappings. The latter mapping maps

attribute names that are valid for the element to the default value of

the attribute, or if there is no default to \code{None}. The default

\end{memberdesc}

\begin{memberdesc}{elements}

A mapping of element names to tuples. The tuples contain a function

for handling the start and end tag respectively of the element, or

\code{None} if the method \method{unknown_starttag()} or

\method{unknown_endtag()} is to be called. The default value is the

\end{memberdesc}

\begin{memberdesc}{entitydefs}