See https://community.jboss.org/docs/DOC-47970. A bit of a data dump, but hopefully useful.
I also started on https://docs.jboss.org/author/display/AS72/Extending+JBoss+AS+7#ExtendingJBossAS7-KeyInterfacesandClassesRelevanttoExtensionDevelopers but it will probably be a while before I finish that off.
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