merged the current state of XML Schemas implementation, it is not

* Makefile.am TODO_SCHEMAS configure.in genUnicode.py testAutomata.c
 testRegexp.c testSchemas.c xmlregexp.c xmlschemas.c xmlschemastypes.c
 xmlunicode.c include/libxml/Makefile.am
 include/libxml/schemasInternals.h include/libxml/xmlautomata.h
 include/libxml/xmlregexp.h include/libxml/xmlschemas.h
 include/libxml/xmlschemastypes.h include/libxml/xmlunicode.h
 include/libxml/xmlversion.h.in : merged the current state of
 XML Schemas implementation, it is not configured in by default,
 a specific --schemas configure option has been added.
* test/automata test/regexp test/schemas Makefile.am
  result/automata result/regexp result/schemas:
  merged automata/regexp/schemas regression tests
Daniel

include/libxml/xmlschemas.h

@@ -0,0 +1,105 @@
+/*
+ * schemas.h : interface to the XML Schemas handling and schema validity
+ *             checking
+ *
+ * See Copyright for the status of this software.
+ *
+ * Daniel.Veillard@w3.org
+ */
+
+
+#ifndef __XML_SCHEMA_H__
+#define __XML_SCHEMA_H__
+
+#if defined(WIN32) && defined(_MSC_VER)
+#include <libxml/xmlwin32version.h>
+#else
+#include <libxml/xmlversion.h>
+#endif
+#ifdef LIBXML_SCHEMAS_ENABLED
+
+#include <libxml/tree.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    XML_SCHEMAS_ERR_OK		= 0,
+    XML_SCHEMAS_ERR_NOROOT	= 1,
+    XML_SCHEMAS_ERR_UNDECLAREDELEM,
+    XML_SCHEMAS_ERR_NOTTOPLEVEL,
+    XML_SCHEMAS_ERR_MISSING,
+    XML_SCHEMAS_ERR_WRONGELEM,
+    XML_SCHEMAS_ERR_NOTYPE,
+    XML_SCHEMAS_ERR_NOROLLBACK,
+    XML_SCHEMAS_ERR_ISABSTRACT,
+    XML_SCHEMAS_ERR_NOTEMPTY,
+    XML_SCHEMAS_ERR_HAVEDEFAULT,
+    XML_SCHEMAS_ERR_NOTNILLABLE,
+    XML_SCHEMAS_ERR_EXTRACONTENT,
+    XML_SCHEMAS_ERR_INVALIDATTR,
+    XML_SCHEMAS_ERR_INVALIDELEM,
+    XML_SCHEMAS_ERR_CONSTRUCT,
+    XML_SCHEMAS_ERR_INTERNAL,
+    XML_SCHEMAS_ERR_NOTSIMPLE,
+    XML_SCHEMAS_ERR_ATTRUNKNOWN,
+    XML_SCHEMAS_ERR_ATTRINVALID,
+    XML_SCHEMAS_ERR_,
+    XML_SCHEMAS_ERR_XXX
+} xmlSchemaValidError;
+
+
+/**
+ * The schemas related types are kept internal
+ */
+typedef struct _xmlSchema xmlSchema;
+typedef xmlSchema *xmlSchemaPtr;
+
+/**
+ * A schemas validation context
+ */
+typedef void (*xmlSchemaValidityErrorFunc) (void *ctx, const char *msg, ...);
+typedef void (*xmlSchemaValidityWarningFunc) (void *ctx, const char *msg, ...);
+
+typedef struct _xmlSchemaParserCtxt xmlSchemaParserCtxt;
+typedef xmlSchemaParserCtxt *xmlSchemaParserCtxtPtr;
+
+typedef struct _xmlSchemaValidCtxt xmlSchemaValidCtxt;
+typedef xmlSchemaValidCtxt *xmlSchemaValidCtxtPtr;
+
+/*
+ * Interfaces for parsing.
+ */
+xmlSchemaParserCtxtPtr xmlSchemaNewParserCtxt(const char *URL);
+void		xmlSchemaFreeParserCtxt	(xmlSchemaParserCtxtPtr ctxt);
+void		xmlSchemaSetParserErrors(xmlSchemaParserCtxtPtr ctxt,
+					 xmlSchemaValidityErrorFunc err,
+					 xmlSchemaValidityWarningFunc warn,
+					 void *ctx);
+xmlSchemaPtr	xmlSchemaParse		(xmlSchemaParserCtxtPtr ctxt);
+void		xmlSchemaFree		(xmlSchemaPtr schema);
+void		xmlSchemaDump		(FILE *output,
+					 xmlSchemaPtr schema);
+/*
+ * Interfaces for validating
+ */
+void		xmlSchemaSetValidErrors	(xmlSchemaValidCtxtPtr ctxt,
+					 xmlSchemaValidityErrorFunc err,
+					 xmlSchemaValidityWarningFunc warn,
+					 void *ctx);
+xmlSchemaValidCtxtPtr	xmlSchemaNewValidCtxt	(xmlSchemaPtr schema);
+void			xmlSchemaFreeValidCtxt	(xmlSchemaValidCtxtPtr ctxt);
+int			xmlSchemaValidateDoc	(xmlSchemaValidCtxtPtr ctxt,
+					 	 xmlDocPtr instance);
+int			xmlSchemaValidateStream	(xmlSchemaValidCtxtPtr ctxt,
+						 xmlParserInputBufferPtr input,
+						 xmlCharEncoding enc,
+					 	 xmlSAXHandlerPtr sax,
+						 void *user_data);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LIBXML_SCHEMAS_ENABLED */
+#endif /* __XML_SCHEMA_H__ */