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<!-- This file illustrates the use of ellipse element and foci_of_conic constraint.
It still has not been run on any DGS, so it may contain bugs. -->
<construction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xml/intergeo.xsd">
<elements>
<ellipse id="e">
<matrix>
<double>3</double>
<double>0</double>
<double>0</double>
<double>0</double>
<double>4</double>
<double>0</double>
<double>0</double>
<double>0</double>
<double>12</double>
</matrix>
</ellipse>
<point id="f1">
<homogeneous_coordinates>
<double>-1</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</point>
<point id="f2">
<homogeneous_coordinates>
<double>1</double>
<double>0</double>
<double>1</double>
</homogeneous_coordinates>
</point>
</elements>
<constraints>
<foci_of_conic>
<point out="true">f1</point>
<point out="true">f2</point>
<conic>e</conic>
</foci_of_conic>
</constraints>
</construction>
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