This is a specification, it does not declare how implementations work.

At the moment only typescript implementation exists and here is PEG grammars from it: https://github.com/podlite/podlite/blob/main/packages/podlit...

At the moment it supports Mermaid diagrams:

https://pod6.in/#p=%3Dbegin+Mermaid++%3Acaption%28%27Caption...