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<!-- This file is to illustrate the use of the element ray and constraint ray_from_point_through_point.
It still has not been run on any DGS, so it may contain bugs.
r is the ray starting at B and passing through C.
-->
<construction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xml/intergeo.xsd">
<elements>
<point id="B">
<homogeneous_coordinates>
<double>1.0</double>
<double>0.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<point id="C">
<homogeneous_coordinates>
<double>2.0</double>
<double>1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<ray id="r">
<homogeneous_coordinates>
<double>1.0</double>
<double>0.0</double>
<double>1.0</double>
</homogeneous_coordinates>
<homogeneous_coordinates>
<double>2.0</double>
<double>1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</ray>
</elements>
<constraints>
<free_point>
<point out="true">B</point>
</free_point>
<free_point>
<point out="true">C</point>
</free_point>
<ray_from_point_through_point>
<ray out="true">r</ray>
<point>B</point>
<point>C</point>
</ray_from_point_through_point>
</constraints>
</construction>
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