hello.nod.xml

<?xml version="1.0" encoding="UTF-8"?>
<nodes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/nodes_file.xsd">
    <node id="1" x="250.0" y="0.0" />
    <node id="2" x="150.0" y="0.0" />
    <node id="3" x="50.0" y="0.0" />
    <node id="4" x="150.0" y="100.0" />
    <node id="5" x="50.0" y="100.0" />
    <node id="6" x="150.0" y="-100.0" />
    <node id="7" x="50.0" y="-100.0" />

</nodes>