Message

Value MUST be part of code list 'ISO 639-1 Language Codes'.

Context
/espd:ESPDResponse/ccv:Criterion/ccv:LegislationReference
Test
not(@langID) or (some $code in $clLanguageCodeEU satisfies $code = @langID)
Code lists
ISO 639-1 Language Codes
Usage
/ espd:ESPDResponse / ccv:Criterion / ccv:LegislationReference / @langID