<construction><elements><point id="P"><homogeneous_coordinates><double>2</double><double>5</double><double>1</double></homogeneous_coordinates></point><line id="l"><homogeneous_coordinates><double>7</double><double>3</double><double>-29</double></homogeneous_coordinates></line><point id="Q"><homogeneous_coordinates><double>5</double><double>-2</double><double>1</double></homogeneous_coordinates></point></elements><constraints><line_through_two_points><line out="true">l</line><point>P</point><point>Q</point></line_through_two_points></constraints></construction>