added Datatype ID and IDREF, usable from RelaxNG now need to add a new

* relaxng.c valid.c xmlschemastypes.c: added Datatype ID
  and IDREF, usable from RelaxNG now
* include/libxml/xmlschemastypes.h: need to add a new interface
  because the validation modifies the infoset
* test/relaxng/testsuite.xml: extended the testsuite
Daniel
7 files changed