code: public WasGeneratedBy newWasGeneratedBy(QualifiedName id, QualifiedName entity, QualifiedName activity) {
     	WasGeneratedBy res=newWasGeneratedBy(id,entity,null,activity);	
     	return res;
      }
docs: A factory method to create an instance of a generation {@link WasGeneratedBy}
  @param id an optional identifier for a usage
  @param entity an identifier for the created <a href="http://www.w3.org/TR/prov-dm/#generation.entity">entity</a>
  @param activity an optional identifier  for the <a href="http://www.w3.org/TR/prov-dm/#generation.activity">activity</a> that creates the entity
  @return an instance of {@link WasGeneratedBy}