Fix namespace vs. node type issue in a generic way.

third_party/libxml/src/include/libxml/tree.h

 /*
  * Summary: interfaces for tree manipulation
  * Description: this module describes the structures found in an tree resulting
  *              from an XML or HTML parsing, as well as the API provided for
  *              various processing on that tree
  *
  * Copy: See Copyright for the status of this software.
  *
  * Author: Daniel Veillard
  */
@@ skipping 333 matching lines @@
  *
  * xmlNsType is unified with xmlElementType.
  */
 
 typedef struct _xmlNs xmlNs;
 typedef xmlNs *xmlNsPtr;
 struct _xmlNs {
     struct _xmlNs  *next;       /* next Ns link for this node  */
     xmlNsType      type;        /* global or local */
     const xmlChar *href;        /* URL for the namespace */
+    const char* dummy_children; /* lines up with node->children */
     const xmlChar *prefix;      /* prefix for the namespace */
     void           *_private;   /* application data */
     struct _xmlDoc *context;            /* normally an xmlDoc */
 };
 
 /**
  * xmlDtd:
  *
  * An XML DTD, as defined by <!DOCTYPE ... There is actually one for
  * the internal subset and for the external subset.
@@ skipping 879 matching lines @@
 #endif
 #ifdef __cplusplus
 }
 #endif
 #ifndef __XML_PARSER_H__
 #include <libxml/xmlmemory.h>
 #endif
 
 #endif /* __XML_TREE_H__ */