Validation of request entities

Hi,

In a versioning repository it may be required to validate the
request entity before updating a version. This can be as simple
as structural validation or application-specific validation
rules may be implemented.

When validation errors are found it is not sufficient to just
return a status-code. In order for the user to learn where
the problems exactly are, the repository should be able to
return the request entity with annotations about the errors.

A possible solution is to give the POST method similar additional
semantics as the PUT method. Its response entity could contain
the annotated document.

Regards,

Werner.
-- 
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