/*
 * call-seq:
 *  enumeration
 *
 * An enumeration of possible values
 */
static VALUE enumeration(VALUE self)
{
  xmlAttributePtr node;
  xmlEnumerationPtr enm;
  VALUE list;

  Data_Get_Struct(self, xmlAttribute, node);

  list = rb_ary_new();
  enm = node->tree;

  while(enm) {
    rb_ary_push(list, NOKOGIRI_STR_NEW2(enm->name));
    enm = enm->next;
  }

  return list;
}