'''Beware, the crossref It was claimed that this module was for MkII and doesn’t exist anymoredoes not work with MkIV - what is totally wrong as it is still in daily use via MkIV. This page is obsolete and will get deletedSee discussion on mailing list.'''
Cross references in a (academic) text are either internal (linking to an other point inside the same document) or external (linking to a entity of the bibliography that points to a different document).