OrderBy(Project(Extend(Extend(Extend(Extend(AggregationJoin(Aggregation(??agg1: ?s, SAMPLE,
                                                            {},
                                                            G1=Group((?s),
                                                               BGP( ?s <http://purl.org/dc/elements/1.1/date> ?date .
                                                                ?s <http://purl.org/dc/elements/1.1/creator> ?creator .
                                                                ?s <http://purl.org/dc/elements/1.1/title> ?title .
                                                                ?s <http://www.idemb.org/idemb#repository> ?repository .
                                                                ?creator <http://xmlns.com/foaf/0.1/name> ?name))),
                                            Aggregation(??agg2: ?date, SAMPLE,
                                            {}, G1),
                                            Aggregation(??agg3: ?name, SAMPLE,
                                            {}, G1),
                                            Aggregation(??agg4: ?title, SAMPLE,
                                            {}, G1)),
                                            ?s,
                                            ??agg1),
                                     ?articledate,
                                     ??agg2),
                              ?authorname,
                              ??agg3),
                       ?articletitle,
                       ??agg4),
                {?s, ?articledate, ?authorname, ?articletitle}), (asc (?articledate)))