/*
 * call-seq:
 * base_uri
 *
 * Get the xml:base of the node
 */
static VALUE base_uri(VALUE self)
{
  xmlTextReaderPtr reader;
  const char * base_uri;

  Data_Get_Struct(self, xmlTextReader, reader);
  base_uri = (const char *)xmlTextReaderBaseUri(reader);
  if (base_uri == NULL) return Qnil;

  return NOKOGIRI_STR_NEW2(base_uri);
}