public class Dimension extends Configurable {
  public final ValueProperty<Measure<Area>> area = new ValueProperty<Measure<Area>>("area");
  public final ValueProperty<Measure<Length>> perimeter = new ValueProperty<Measure<Length>>("perimeter");
  public final ValueProperty<Measure<Length>> height = new ValueProperty<Measure<Length>>("height");
 

public class Horizontal extends SomethingUsingDimension {
  public final ValueProperty<Boolean> hasBox = new ValueProperty<Boolean>("hasBox");
  
  private final void init_hasBox() {
    hasBox.setAttribute(PropertyAttribute.VISIBLE,Boolean.valueOf(true));    
  }
  
  protected void init() {
    super.init();
    registerProperty("hasBox", hasBox);
    init_hasBox();
    
    // this line I want to write :   dimension.height = 100 mm
    dimension.getValue().get().height.setValue(Measure.valueOf(100d, SI.MILLI(SI.METER)));
  }
}

package org.xtext.example.mydsl

import java.util.Optional

class Dimension {
	 public val ValueProperty<Measure<Area>> area = new ValueProperty<Measure<Area>>("area");
  public val ValueProperty<Measure<Length>> perimeter = new ValueProperty<Measure<Length>>("perimeter");
  public val  ValueProperty<Measure<Length>> height = new ValueProperty<Measure<Length>>("height");
	
}

class Main {
	
	def static void handle(Dimension dimension) {
		dimension.height = 10
	}
	
	def static setHeight(Dimension d, int height) {
		//TODO
	}
	
	def static int getHeight(Dimension d) {
		//TODO
		0
	}
}

class ValueProperty<T> {
	
	new(String s)  {
		
	}

	def Optional<T> getValue() {
		return null;
	}
}

class Area {
	
}

class Length {
	
}

class Measure<T> {
	
}