Time to work on helping the Gnome Doc project, first step is reintegrating
the SGML DocBook parser in libxml2 distrib:
- DOCBparser.c DOCBparser.h testDocbook.c configure.in Makefile.am
  xmlversion.h.in: started (re)integrating the DocBook SGML parser.
- SAX.[ch]: cleanup and updates for DocBook
- debugXML.c parser.h tree.[ch] valid.c xpath.c: small macro or
  ex SGML identifier changes
- valid.c: removed a static unused function.
Daniel
diff --git a/tree.h b/tree.h
index 08321a2..be03864 100644
--- a/tree.h
+++ b/tree.h
@@ -54,8 +54,8 @@
     XML_NAMESPACE_DECL=		18,
     XML_XINCLUDE_START=		19,
     XML_XINCLUDE_END=		20
-#ifdef LIBXML_SGML_ENABLED
-   ,XML_SGML_DOCUMENT_NODE=	21
+#ifdef LIBXML_DOCB_ENABLED
+   ,XML_DOCB_DOCUMENT_NODE=	21
 #endif
 } xmlElementType;