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<!-- This example illustrates the midpoint_of_line_segment constraint -->
<construction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xml/intergeo.xsd">
<elements>
<point id="A">
<homogeneous_coordinates>
<double>-3</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</point>
<point id="B">
<homogeneous_coordinates>
<double>3</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</point>
<point id="C">
<homogeneous_coordinates>
<double>0</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</point>
<line_segment id="s">
<homogeneous_coordinates>
<double>-3</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
<homogeneous_coordinates>
<double>3</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</line_segment>
</elements>
<constraints>
<line_segment_by_points>
<line_segment out="true">s</line_segment>
<point>A</point>
<point>B</point>
</line_segment_by_points>
<midpoint_line_segment>
<point out="true">C</point>
<line_segment>s</line_segment>
</midpoint_line_segment>
</constraints>
</construction>
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