2 isobjtype - whether a string names an object type
13 isobjtype(str) returns 1 or 0 according as an object type with name
14 str has been defined or not defined.
32 isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
33 ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
34 isodd, isprime, isrand, israndom, isreal, isrel,
35 issimple, issq, isstr, istype