IMO, there should be a common location for all the jboss specific annotations. Hence i think the ejb3-ext-api is the right place for this. anonymous wrote : Also we need to be able to extend jboss-metadata to allow plugins, so that the retry function can be enabled via descriptors. | I am not really good at xml xsd and similar things, but i guess there would be some option available where in we can say a given xsd element (ex: sessionBeanType) can have multiple different type of sub-elements whose type is not known. Just an example in jboss.xml <session> | <tx-retry>numberofattempts</tx-retry> | ...// later on for some other functionality | <xyz>blahblahblah</xyz> | </session> View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4235975#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...