It is well known that modern generalized markup systems, such as SGML and XML, evolved from the ‘presentational’ markup contained in early digital documents intended for printing (Goldfarb, 1996, 1997). XML, whose specification was co-authored by a humanist, Michael Sperberg Mc-Queen (Bray et al., 1998), is used as a metalanguage to define most of the actual markup languages in use today.