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Metadata Repository should be to be standard based. Currently the repository is MOF based (for more information on MOF see OMG MOF Specification in http://cgi.omg.org/cgi-bin/doc?formal/00-04-03.pdf document). There is an ongoing effort in JCP to create MOF->Java mapping, also called Java Metadata Interface (JMI). As soon as this specification (JSR-40) gets public, MDR has to be updated to be compliant with it.
MDR now passes 100% of TCK tests.