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Hello!

MODS 3.4 XML Schema available at
http://www.loc.gov/standards/mods/mods.xsd defines

xs:simpleType name="languageAuthorityAttributeDefinition"

as an

xs:restriction base="xs:string"

containing (among others)

xs:enumeration value="rfc4646"

But RFC-4646 is now obsoleted and replaced by

http://tools.ietf.org/rfc/rfc5646.xml

which takes into account RFC-5645 containing some important improvements. 
Therefore, I would suggest to slightly modify

http://www.loc.gov/standards/mods/mods.xsd

to support RFC-5646, which could be achieved with the additon of

xs:enumeration value="rfc5646"

in the definition of

xs:simpleType name="languageAuthorityAttributeDefinition"

Regards!

SaaĊĦha,