I am working on the mod_cluster part of the schema.
http://github.com/jfclere/jboss-as
I have cut the mod_cluster description in 2 parts one that depends on httpd directive (httpd-conf-attlistType) and one that contains nodes parameters (nodes-conf-attlistType).
The httpd-conf-attlistType will have the Advertise part, list of proxies, SSL information to connect to httpd etc and nodes-conf-attlistType will have stuff like excluted contexts, stop timeout etc.