No it is not. RFC 2252 is somewhat inprecise in this respect (speaking about structural object classes), but it referrs to the X.500 Object model. Structural object classes build a single object class chain; multiple inheritance is not possible.
-- Norbert Klasen, Dipl.-Inform. DAASI International GmbH phone: +49 7071 29 70336 Wilhelmstr. 106 fax: +49 7071 29 5114 72074 Tübingen email: norbert.klasen@daasi.de Germany web: http://www.daasi.de