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I can only find some db schemas, what about all the rest of business logics in UML ?

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What exactly are you after? There are API documents and the codex. What architecture type documents are you looking for - sequence diagrams? Class diagrams? – Kris C Oct 16 '10 at 21:39
@asksuperuser - These generally are not some the open-source WordPress community focuses on doing. Do you need these for your own use or because someone you are developing a system for has stated that having them is a requirement? – MikeSchinkel Oct 17 '10 at 7:54

I'm not aware of any besides michel fortin's WP text flow diagram from a few years ago:


That said, there were recent talks about writing some kind of plugin dev's companion reference with the full flowchart of the WP hooks and API.

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It's not business logic in UML (which would benefit from some refactoring of core first, right?), just some workflow PDF: Wordpress 3.0 Program Flow (PDF) Preview

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