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<!-- This example ilustrates the use of the conic element
Concretely, the circle (x-1)^2 + (y-3)^2 = 4 has matrix
( 1 0 -1 )
( 0 1 -3 )
( -1 -3 6 )
-->
<construction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xml/intergeo.xsd">
<elements>
<conic id="c">
<matrix>
<double>1</double>
<double>0</double>
<double>-1</double>
<double>0</double>
<double>1</double>
<double>-3</double>
<double>-1</double>
<double>-3</double>
<double>6</double>
</matrix>
</conic>
</elements>
<constraints>
<!-- -->
</constraints>
</construction>
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