/*
 * call-seq:
 *  length
 *
 * Get the length of the node set
 */
static VALUE length(VALUE self)
{
  xmlNodeSetPtr node_set;
  Data_Get_Struct(self, xmlNodeSet, node_set);

  if(node_set)
    return INT2NUM(node_set->nodeNr);

  return INT2NUM(0);
}