My code is not yet CPAN ready, (nor production ready really) however I do have a forum system running on it which seems fast enough on a small $20 a month server. I would probably have real problems if a few hundred users tried to browse it at the same time on the current implementation lol.

As for code correctness, there is a very simple set of rules for tags and the rest is left upto the developer. There will be a very small number of built in tag names to access some standard primitives but after that the code would be application specific.

For instance 

<use><qd>action</></>   

would use 2 built in primitives (use&qd) to process the action named i
+n the query

where

<shop::cart::contents></>
[download]

would use &contents from a shop::cart package which deals with the DBI or your choice of ORM etc. The versions out there already don't support this but I have made a lot of progress since then in many directions and I'm hoping to start pulling it all together into a coherant form quite soon... it just depends how long this compiler takes to get going.