I've been looking around the site for documentation on how to develop for XOOPS; more specifically, how to develop new modules and blocks - files to create, API to implement the XOOPS core will call, classes I should know about, how to integrate with the XOOPS administration system, etc., but I haven't found any guides (or tutorials). Where should I start?

Thanks in advance.

(Note: I forgot to say I have proper knowledge of PHP, HTML, CSS, SQL, and portal concepts. I just need to know what should I implement to develop modules and blocks and where can I find documentation of the XOOPS APIs beyond the headers available in Development: API Doc I can generate myself.)

Um... excuse me. Why do you need to make it XHTML compilant? What users need when browsing a site is not the latest, furious standard compilance, but a fast, minimalist, non-bloated HTML. Ever noticed how Google is so blazingly-fast? Take a look at the HTML you're receiving - this is one of the reasons. XOOPS could implement a filter to optimized HTML by replacing all these <br /> by <br>, remove </td>, </tr>, etc., get rid of double spaces (CR and LF are also spaces), and so on, if you want it to be faster.

I'm in charge of evaluating software, designing and creating a corporate portal for a Spanish multinational company. XOOPS is one of the two finalists from the 15 different portals I preselected and evaluated. Great job!

I wanted to know how hard do the XOOPS gurus think it would be to adapt it to use an Oracle database. (I don't need to use an existing database; I need the protal to rely on Oracle.) Did anybody ever try to do this? Are there important issues that would make this specially difficult?