[mpeg-OTspec] Conflicts between language system tags

[John Hudson]

On 26/02/13 4:18 PM, Martin Hosken wrote:

> Another thought came to my mind is that we say "if the lang tag is 4
> char then it uses iso639-3 codes"

We already have four-character language system codes that do not conform 
to that: <IPPH> and <AMPH> for IPA and Americanist phonetic 
transcription. When Peter and I spec'd those, we were thinking in terms 
of a four-character code indicating a non-natural language script use, 
but figured there might be other uses for such tags, as we now face. I 
think it would be a mistake to try to link the number of characters in a 
tag to particular assumptions, but instead assign meaning to specific 
prefix characters as proposed by Andrew and Peter.

J.


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