I don't think we need any new characters, ZERO WIDTH SPACE would do and it requires no new semantics.
ZERO WIDTH SPACE would screw up search and sort algorithms, I think, because it is not a control character per se and may not be ignored as desired.
I've made some tests using Ken's ZWJ suggestion and, as feared, it messes with the glyph positioning lookups. The results varied slightly between MS RichText clients and InDesign ME, but both displayed marks incorrectly when ZWJ was inserted. I strongly suspect that this is not something that can easily be resolved in the glyph shaping model.
John Hudson
Tiro Typeworks www.tiro.com Vancouver, BC [EMAIL PROTECTED]
If you browse in the shelves that, in American bookstores,
are labeled New Age, you can find there even Saint Augustine,
who, as far as I know, was not a fascist. But combining Saint
Augustine and Stonehenge -- that is a symptom of Ur-Fascism.
- Umberto Eco
