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The Javadoc for the DataObject.Registration annotation mimeType attribute incorrectly indicates that multiple mimeTypes are supported. It does not appear that DataObjectFactoryProcessor handles multiple mimeTypes.
http://hg.netbeans.org/core-main/rev/5f4e1598a7f9 Fixed. Thank you very much for reporting.
Integrated into 'main-silver', will be available in build *201311270002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/5f4e1598a7f9 User: Jaroslav Havlin <jhavlin@netbeans.org> Log: #238708: DataObject.Registration annotation documentation is incorrect