This is not the final website. It is a demo of the real tool working, made for Y Combinator.
AxisRemedy

11-003 Natural language in the Outline entries cannot be determined.

The language of outline (bookmark) text cannot be determined.

Checkpoint
11: Declared Natural Language
ISO 14289-1 (PDF/UA-1) clause
7.2-3
Test type in the protocol
Machine-testable
Applies to
A single object

How AxisRemedy handles it

Tested by the app. AxisRemedy tests this condition itself. For each document it records passed, failed or not applicable, and for every failure the object and the page.

What the check covers

Decided from the catalog /Lang when the document has bookmarks.