public PnArbolCollection FetchByQuery(Query qry)
        {
            PnArbolCollection coll = new PnArbolCollection();

            coll.LoadAndCloseReader(qry.ExecuteReader());
            return(coll);
        }
        public PnArbolCollection FetchAll()
        {
            PnArbolCollection coll = new PnArbolCollection();
            Query             qry  = new Query(PnArbol.Schema);

            coll.LoadAndCloseReader(qry.ExecuteReader());
            return(coll);
        }