I am trying to find documentation for the xml interface in lua. Explanation/tutorial for the use of functions like xml.first, the ‘.’ interface, etc. I see examples of their use but not everything is immediately clear to me.

Gerben Wierda
Chess and the Art of Enterprise Architecture <https://ea.rna.nl/the-book/>
Mastering ArchiMate <https://ea.rna.nl/the-book-edition-iii/>
Architecture for Real Enterprises <https://www.infoworld.com/blog/architecture-for-real-enterprises/> at InfoWorld
On Slippery Ice <https://eapj.org/on-slippery-ice/> at EAPJ