A Nature can be seen as a view representing a subset of meta-information concerning the object-paradigm (e.g. abstract, extends, tbc.), XML (e.g. ns, nsprefix, tbc.) or JDO (e.g. tablename, columns, identities, tbc.) attributes.
Class and FieldInfo attributes should be accessable through these Natures.
This task includes a discussion on the mailing list. Furthermore class diagrams should be created an a corresponding wiki entry should be created. Please do also write JUnit testcases to "try" and test the new functionality.