---
title: Behavioral Modeling - Power Window
...

# Modeling variability and structures with variability

## Feature modeling

### Metamodel

```clafer
abstract final Feature
abstract final FeatureModel
```

### Model 

```clafer
WinFeatures : FeatureModel
    manualUpDown : Feature
    express : Feature ?
        pinchProtection : Feature ?
```

## Structural modeling

### Metamodel

```clafer
abstract final Component
    abstract Port
abstract final Command
abstract State
abstract StateMachine
```

### Model 

Commands and requests.

```clafer
motorUp : Command
motorStop : Command
motorDown : Command

abstract final UserRequest
up : UserRequest
expressUp : UserRequest ?
stop : UserRequest
down : UserRequest
```

Window motor

```clafer
WinMotor : Component
    // cmd : Port -> Command
    cmd -> Command
```