jaxb vs jaxp for XML validation

Given an XSD schema with key/keyref constraints,
which XML processing to use- JAXB or JAXP?

 JAXB is great because I get Marshal/Unmarshal
capability. But JAXB 1.0 doesn't seem to support
Key/Keyref constraint validation. JAXP seems to
support this Key constraint validation in XSD. But,
one has to implement Marshal/Unmarshal which doesn't
come free here.
 
 Obviously in my case, I do need to construct Java
object for the incoming XML and vice-versa.


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