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Validation is done on request call based on xsd. Note that for entities in the system the xsd like for RP entity or GRANT entity will generate at system startup and put them in ws-xsd (configurated on dspacecris.cfg with key webservices.xsd.path) directory on dspace local directory. The only one to copy onto directory by hand is request contract and response contract for publications (you can find these in WEB-INF\classes directory onto webapp).
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