# W-LIB011

Source: https://xmlvalid.com/rules/W-LIB011

> The attribute languageID should be used when more than one … element is present

- Level: warning
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `count(../cbc:Note) > 1 and not(./@languageID)`

Validate a document against these rules: https://xmlvalid.com/validate