removed separate logtypes field of syntax; removed test_read, simple_str_of_sort, simple_string_of_typ; provide default_mode;
consts normal :: ifex => bool
primrec
"normal(CIF b) = True"
"normal(VIF x) = True"
"normal(IF b t e) = (normal t & normal e &
(case b of CIF b => True | VIF x => True | IF x y z => False))"