I just noticed an unsuspected link between catlangs and Federated Wiki (for which I recently added a link to the catalog).
If you click this link, you will see demo of a Wiki plugin under development.
What’s interesting here is that the two pages on the left are the data that the code in the page on the right analyzes. It looks a bit like three words of Forth!
If you try to follow the explanation in the third Wiki page, it may help to know that “lineup” is Wiki jargon for a specific sequence of pages (which is defined by the URL). Code in Wiki pages can request this lineup, and that’s how you most frequently provide data to such code.