+ ///
+ /// \param output_active : is the inset active or is it in an inactive
+ /// branch or a note?
+ ///
+ /// \param utype : is the toc being generated for use by the output
+ /// routines?
+ ///
+ /// \param tocbackend : where to add the toc information.
+ virtual void addToToc(DocIterator const & /* di */,
+ bool /* output_active */,
+ UpdateType /* utype*/,
+ TocBackend & /* tocbackend */) const {}