:lang(az-Arab-IR), xml:lang="az-Arab-IR"

Ignore this test. (:lang with xml:lang is not supported)
You can only get meaningful results for this test if :lang works with xml:lang, since it checks a detail with regard to that support.

Assertion: A :lang value with language, script and region subtags will match a xml:lang attribute value with the same language, script and region subtags.

Notes:You can only get meaningful results for this test if :lang works with xml:lang, since it checks a detail with regard to that support. If :lang does not work with xml:lang, the test should show a message "Ignore this test." You should ignore the instructions and test results that follow and mark the results as "not applicable".