/*
 * call-seq:
 *   value
 *
 * Get the text value of the node if present
 */
static VALUE value(VALUE self)
{
  xmlTextReaderPtr reader;
  Data_Get_Struct(self, xmlTextReader, reader);
  const char * value = (const char *)xmlTextReaderConstValue(reader);
  if(value == NULL) return Qnil;

  return NOKOGIRI_STR_NEW2(value);
}