SimpleFeature feature = (SimpleFeature) f.next();
SimpleFeatureType schema = feature.getFeatureType();
// get the next fid
LinkedList fids = (LinkedList) schema2fids.get(schema.getTypeName());
String fid = ((FeatureId) fids.removeFirst()).getID();
insertedFeature = WfsFactory.eINSTANCE.createInsertedFeatureType();
insertedFeature.setHandle(insert.getHandle());
insertedFeature.getFeatureId().add(filterFactory.featureId(fid));