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http://help.eclipse.org/juno/index.jsp?topic=/org.eclipse.pde.doc.user/reference/api-tooling/api_javadoc_tags.htm The help page describes which tags are valid for what. This will have to be updated for any changes we make in 4.3 (such as @noreference on types). We may also want to add a separate section listing the other restrictions we have. Though the error messages are intended to be descriptive enough.
Pushed changes to: http://git.eclipse.org/c/platform/eclipse.platform.common.git/commit/?id=fb636e3bf7049167518c2cb6b2e6231d702cae85 to describe how the @noreference tag applies to types and updated the table. I also created a new wiki page to talk about the tags and how they apply: http://wiki.eclipse.org/PDE/API_Tools/Javadoc_Tags
Looks great.