/// return the caption text
int getCaptionAsPlaintext(odocstream & os, OutputParams const &) const;
/// return the caption text as HTML
/// return the caption text
int getCaptionAsPlaintext(odocstream & os, OutputParams const &) const;
/// return the caption text as HTML
///
void addToToc(DocIterator const & di, bool output_active, UpdateType utype,
TocBackend & backend) const;
///
void addToToc(DocIterator const & di, bool output_active, UpdateType utype,
TocBackend & backend) const;