/*
 * call-seq:
 *  dup
 *
 * Copy this node.  An optional depth may be passed in, but it defaults
 * to a deep copy.  0 is a shallow copy, 1 is a deep copy.
 */
static VALUE duplicate_node(int argc, VALUE *argv, VALUE self)
{
  VALUE level;
  xmlNodePtr node, dup;

  if(rb_scan_args(argc, argv, "01", &level) == 0)
    level = INT2NUM((long)1);

  Data_Get_Struct(self, xmlNode, node);

  dup = xmlDocCopyNode(node, node->doc, (int)NUM2INT(level));
  if(dup == NULL) return Qnil;

  return Nokogiri_wrap_xml_node(rb_obj_class(self), dup);
}