nt:unstructured allows any number of properties with any names. but
with OCM, we can only set predefined properties on a jcr node. It's
not flexible sometime. for example, a CmsObject may have some optional
properties then user can place owner information or something else. Maybe we
can add a callback feature in ObjectConverterImpl that allows some
annotated methods in an ocm object will be callback during saving or
retrieving the object
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