/// \return formatted BibTeX data associated with a given key.
/// Empty if no info exists.
/// Note that this will retrieve data from the crossref as needed.
+ /// If \param richtext is true, then it will output any richtext tags
+ /// marked in the citation format and escape < and > elsewhere.
docstring const getInfo(docstring const & key, Buffer const & buf,
bool richtext = false) const;
/// Is this a reference from a bibtex database