Language code

An ONIX code indicating a language. Mandatory in each occurrence of the <Language> composite, and non-repeating.

Format	Fixed length, three lower-case letters, based on ISO 639-2/B. Note that ISO 639 specifies that these codes should always be in lower-case
ReferenceName	<LanguageCode>
ShortTag	<b252>
Cardinality	1
Example	eng