object invok featur map object vt object subject featur type object paramet type equal todo implement differ ocl kind ocl type featur trim equal ocl kind featur trim equal ocl type type ocl type paramet type equal ocl model facad type subject featur trim equal ocl type subject subject ocl type featur trim equal ocl type subject subject featur trim equal size subject length featur trim equal concat subject concat paramet featur trim equal lower subject lower featur trim equal upper subject upper featur trim equal substr subject substr integ paramet integ paramet 