have a look at the XML Schema documents that describe those descriptors.
You can find them in the client-api module -- e.g. here: https://git.fedorahosted.org/cgit/rhq/rhq.git/tree/modules/core/client-api/src/main/resources
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Hint: You can import those XSDs into Eclipse and have nice documentation and code completion available in your plugin descriptors.
Smart answer Thank you