working on DTD validation on top of xml reader interfaces. Allows to * testReader.c xmlreader.c valid.c include/libxml/tree.h include/libxml/valid.h include/libxml/xmlreader.h: working on DTD validation on top of xml reader interfaces. Allows to validate arbitrary large instances. This required some extensions to the valid module interface and augmenting the size of xmlID and xmlRef structs a bit. * uri.c xmlregexp.c: simple cleanup. Daniel