From a bibliographical point of view this is a challenging situation, because the contribution of persons listed in a catalog record should in principle be obvious to the user. To this purpose, the UNIMARC standard used in French libraries lists ‘relators’, codes that clarify the relation between the work in question and the persons listed in the catalog record. But neither <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">praes</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">id</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">es</hi> nor <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">respondens</hi> are categories to be found in this list (Willer 2009, 600–12). So how did French librarians deal with this situation?