In the current Wordnet-LMF DTD only conceptual relations (i.e., SynsetRelations in the terminology of Wordnet-LMF), which hold between synsets, are modeled.
antonymy, which is a typical example of a lexical relation (see (Fellbaum, 1998) for further details), can cur-rently not be modeled without violating the Wordnet-LMF DTD.