There are rumors that Pango processes cantillation correctly - possibly, with good fonts? We need to accertain - with Behdad? - that we do not need special support from Pango, and that expressive power of OpenType is sufficient.

InDesign [InDesign] and its storage format INX [INX] are something to think about in the context of Outside-In XML Publishing [Outside-In].

"Typesetting Hebrew Cantillation".