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John Hudson said:But there is no documented de facto standard for most of the langsys tags...
Peter Constable said:
But there is no de facto standard.
John Hudson said:
Of course, though, once you have a model that treats language X as default processing in a font and languages Y and Z as having variant behaviour, you have created the possibility that someone may want to build a font that treats Y or Z as default processing and the others the variants. So unless a de facto standard implies always that a particular language is default, registering all the languages with behaviours that vary from each other becomes necessary.