def vector_work
      parents.select do |parent|
        parent.class.included_modules.include?(::GeoWorks::VectorWorkBehavior)
      end.to_a
    end
def vector_work
      parents.select do |parent|
        parent.class.included_modules.include?(::GeoWorks::VectorWorkBehavior)
      end.to_a
    end
Retrieve the Vector Work of which this Object is a member
 @return [GeoWorks::VectorWork]