flexibility. Inasmuch, however, as Apple's font tools require the generation of "morx" tables via raw state table information, they can be difficult to produce and debug. The font designer is also responsible for making sure that "morx" subtables are ordered correctly for the desired effect.

AAT operates entirely with glyphs and never with characters, so all the layout information necessary for producing the proper display resides within the font itself. This allows fonts to be added for new scripts without requiring any specific support