<!-- 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>
