[JDO-615] MetaData specification API - ASF JIRA

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We can specify MetaData via XML or annotations. The only way missing is via an API. I propose mirroring the XML structure with interfaces of the form

public interface MetaData
{
addExtension(String key, String value);
removeExtension(String key, String value);
...
}

public interface FileMetaData
{
addPackage(PackageMetaData pmd);
...
}

public interface PackageMetaData
{
addClass(ClassMetaData cmd)
...
}

public interface ClassMetaData
{
addField(FieldMetaData fmd)
...
}

public interface FieldMetaData
{
setInheritance(InheritanceMetaData inhmd)
...
}

and so on.

We would then require a method on the PMF to register the metadata.

If there are no objections to such a feature I'll propose a patch to try to provide all current JDO2 capabilities.