Submitted as result of GF#15044 which wasn't open for Jan 2018 ballot.

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Comment:

Fix expansion error and clarify that ISO 639-2 is required per MU Certification Criteria: https://www.loc.gov/standards/iso639-2/php/code_list.php

"RFC 5646 is compatible with C-CDA Release 2. [see also 80 FR 62619]

? Testing for preferred language using the standard at § 170.207(g)(2) (RFC 5646) will

focus on all the languages present in ISO 639-2 [http://www.loc.gov/standards/iso639-

2/php/code_list.php]

? Consistent with the RFC 5646 the shortest alpha code for the language should be

used. Testing will only test the primary language tag and not test for extension

components specified in RFC 5646 such as extended language sub-tags, script tag, nor

region tag. [see also 80 FR 16817] Specifically:

? use alpha 2 character code if one exists (ISO 639-1);

? use alpha 3 character code if an alpha 2 character code does not exist (ISO 639-2); and

? region extensions (ISO 3166-1) are permitted but not required (however, if a region

extension is used, it will be verified for accuracy as part of testing and must be

correct). " https://www.healthit.gov/sites/default/files/2015Ed_CCG_CCDS.pdf

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Summary:

Fix Language Value Set Expansion