xml:lang data type
See the definition in the W3C Extensible Markup Language recommendation. Language names come from ISO 639, with optional country subcodes from ISO 3166.
Where is this type used?
<accidental-text> — "xml:lang" attribute
<credit-words> — "xml:lang" attribute
<directive> — "xml:lang" attribute
<display-text> — "xml:lang" attribute
<footnote> — "xml:lang" attribute
<lyric-language> — "xml:lang" attribute
<rehearsal> — "xml:lang" attribute
<text> — "xml:lang" attribute
<words> — "xml:lang" attribute