// X une classe
// Attached = instance en cache

X a = new X();            // a est detached
DA.save(c);               // a est attached
X b = DA.getEditable(a);  // a attached, b detached
DA.save(b);               // a detached, b attached
DA.delete(b);             // a detached, b detached
DA.save(b);               // a detached, b attached
DA.delete(a);             // 1: réattache a => a attached, b detached ; 2: delete de l'objet => a detached, b detached