I am currently doing some testing with the xor-package. If I use book.cls, it goes in an inifite loop in the mark-processing. If anybody has a fix, I would be interessted. A minimal test-file will follow during the weekend. Regards, Björn -- Bjoern Pedersen Lichtenbergstr.1 Technische Universitaet Muenchen D-85747 Garching ZBE Instrumentierung FRM-II Tel. + 49 89 289-14707 Fax -14666