Abjads represent consonants with full letters, and use optional diacritics
to represent vowels.

1) If a script makes its vowels optional, but uses full letters for them, is
it an abjad?

2) If a script uses diacritic vowels, but requires them, is it an abjad?

Enquiring minds want to know.

--
John Cowan <jcowan@...> http://www.reutershealth.com
I amar prestar aen, han mathon ne nen, http://www.ccil.org/~cowan
han mathon ne chae, a han noston ne 'wilith. --Galadriel, _LOTR:FOTR_