<!-- This file is to illustrate the use of the constraint line_angular_bisectors_of_two_lines .
     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>
		<point id="P">
			<homogeneous_coordinates>
				<double>1</double>
				<double>0</double>
				<double>1</double>
			</homogeneous_coordinates>
		</point>
		<point id="Q">
			<homogeneous_coordinates>
				<double>0</double>
				<double>1</double>
				<double>1</double>
			</homogeneous_coordinates>
		</point>
		<point id="R">
			<homogeneous_coordinates>
				<double>-1</double>
				<double>0</double>
				<double>1</double>
			</homogeneous_coordinates>
		</point>
		<point id="S">
			<homogeneous_coordinates>
				<double>0</double>
				<double>-1</double>
				<double>1</double>
			</homogeneous_coordinates>
		</point>
		<line id="l">
			<homogeneous_coordinates>
				<double>0</double>
				<double>1</double>
				<double>0</double>
			</homogeneous_coordinates>
		</line>
		<line id="m">
			<homogeneous_coordinates>
				<double>1</double>
				<double>0</double>
				<double>0</double>
			</homogeneous_coordinates>
		</line>
		<line id="a">
			<homogeneous_coordinates>
				<double>1</double>
				<double>1</double>
				<double>0</double>
			</homogeneous_coordinates>
		</line>
		<line id="b">
			<homogeneous_coordinates>
				<double>1</double>
				<double>-1</double>
				<double>0</double>
			</homogeneous_coordinates>
		</line>
	</elements>
	<constraints>
		<free_point>
			<point out="true">P</point>
		</free_point>
		<free_point>
			<point out="true">Q</point>
		</free_point>
		<free_point>
			<point out="true">R</point>
		</free_point>
		<free_point>
			<point out="true">S</point>
		</free_point>
		<line_through_two_points>
			<line out="true">l</line>
			<point>P</point>
			<point>R</point>
		</line_through_two_points>
		<line_through_two_points>
			<line out="true">m</line>
			<point>Q</point>
			<point>S</point>
		</line_through_two_points>
		<line_angular_bisectors_of_two_lines>
			<line out="true">a</line>
			<line out="true">b</line>
			<line>l</line>
			<line>m</line>
		</line_angular_bisectors_of_two_lines>
	</constraints>
</construction>
