file3.txt

<gexf version="1.1" xmlns="http://www.gexf.net/1.1draft" xmlns:viz="http://www.gexf.net/1.1draft/viz" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2001/XMLSchema-instance">
  <graph defaultedgetype="undirected" mode="static">
    <nodes>
      <node id="Zelter" label="Zelter" />
      <node id="Humboldt" label="Humboldt" />
      <node id="Goethe" label="Goethe" />
      <node id="Schiller" label="Schiller" />
    </nodes>
    <edges>
      <edge id="0" source="Zelter" target="Goethe" weight="3" />
      <edge id="1" source="Humboldt" target="Goethe" weight="1" />
      <edge id="2" source="Goethe" target="Schiller" weight="12" />
    </edges>
  </graph>
</gexf>