The Xaiml v1.8b specification has been released and can be seen in any of the following Betabot projects. Xaiml will longer be backwards compatible with AIML. Xaiml will continue to add new tags and diverge from AIML. Xaiml allows some minor spelling errors and mismatched tags and still be read correctly by Pysh.
Devyn Collier Johnson holds the copyrights to Xaiml and Pysh.
https://launchpad.net/neobot
https://launchpad.net/novabot-xaiml
https://launchpad.net/pastobot
https://launchpad.net/mourobot