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The existing validation tests attempt to load book.xml which does not currently exist in the CVS. There were files book.xml and book.xsd in tests/validation (see http://dev.w3.org/cvsweb/2001/DOM-Test-Suite/tests/validation/files/Attic) which were removed with a comment that they were in the wrong location, but they were never added to tests/level3/validation/files and book.xsd is not retrievable from the attic.
When fixed, the dom3-val-jar target in build.xml should be updated to uncomment the line that would include the missing files in the jar.