85: Alternative-language code missing

You declared the metadata name lang-, whose purpose is to point to versions of the current document in a different language, but did not provide a language code as defined in BCP 47. However, that is expected.

Solution

Provide a small-letter language code such as fr for French or en-gb for British English directly after the lang- as in the following examples.

@ lang-fr:    ->http://example.org/
@ lang-en-gb: ->/britisch/