docs: public void addExtends(String superType) {
  		if (!Strings.isEmpty(superType)
  				&& !Capacity.class.getName().equals(superType)) {
  			JvmParameterizedTypeReference superTypeRef = newTypeRef(this.sarlCapacity, superType);
  			JvmTypeReference baseTypeRef = findType(this.sarlCapacity, Capacity.class.getCanonicalName());
  			if (isSubTypeOf(this.sarlCapacity, superTypeRef, baseTypeRef)) {
  				this.sarlCapacity.getExtends().add(superTypeRef);
  				return;
  			}
  		}
  	}