InformerType informer) {
QueryExpression returned = null;
for(int index=0; index<id.length; index++) {
FieldInformer fieldInformer = backEnd.getInformer().get(idProperties.get(index).getName());
QueryExpression propertyEquality = fieldInformer.equalsTo(id[index]);
if(returned==null) {
returned = propertyEquality;
} else {
returned = Expressions.and(returned, propertyEquality);
}