* valid.c xmlschemastypes.c: attempt to cope with ID/IDREF(S)
  declared both in the DTD and in the Schemas <grin/>
* relaxng.c: more debug, added a big optimization for <mixed>
* test/relaxng/testsuite.xml: augmented the testsuite
* test/relaxng/ result/relaxng: added the RelaxNG spec and a
  DocBook example to the regression tests
Daniel