[Ltru] 3.1.4: description field uniqueness

[Peter Constable <petercon at microsoft.com>]

Section 3.1.4 of the current draft has this wording:

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Each 'Description' field MUST be unique, both within the record in which it appears and for the collection of records of the same type.
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I'm not positive I understand the intent for the second requirement, unique "for the collection of records of the same type". It sounds like that's saying that, if (say) a language record has a description field with the value "foo", then no other language record can have a description "foo".

If that's the case, then what about cases such as the records for the language subtags 'jv' and 'jw', both of which have a description "Javanese"?

Would the following revised text be an improvement?

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Each 'Description' field MUST be unique within a given record. Also, each 'Description' field must be unique across the collection of records of the same type with the following exception: if a particular 'Description' field occurs in multiple records of a given type, then one of those records MUST be for a subtag listed in all the other records as Preferred-Value.
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I think that covers the Javanese, Hebrew and such cases.

(I still hope we don't one day down the road find it overly restrictive should, e.g., two 639-2 entries each have multiple language names, one of which is common to both.)



Peter
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