Ohne Nutzung des Pfad-Attributs – oh je  Self-Joins select n.Wert from InfoTab b, InfoTab as, InfoTab a, InfoTab n where b.Tag = Buch and as.Tag = Autoren and a.Tag = Autor and n.Tag = Nachname and b.KnotenTyp = Element and as.KnotenTyp = Element and a.KnotenTyp = Element and n.KnotenTyp = Element and PARENT(as.ORDpfad) = b.ORDpfad and as.DOCid =b.DOCid and PARENT(a.ORDpfad) = as.ORDpfad and a.DOCid = as.DOCid and PARENT(n.ORDpfad) = a.ORDpfad and n.DOCid = a.DOCid
{}