ID for language-invariant strings

[Mark Davis]

Peter,

To me, the choice of zxx vs und depends on your goal in the particular case.

   1. If the goal is to have a category for a pure 'code',non-linguistic
   like an ISO script code or other tags or codes that are intended to be used
   internal to programs, then 'zxx' would be appropriate.
   2. If the goal is to have a category for a 'name' that is linguistic,
   but meant to be some sort of neutral 'fallback' that is comprehensible by
   people coming from a wide variety of linguistic backgrounds, then 'und'
   would be appropriate.

Mark
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