XML Source

<source>
     <AAA>height: default</AAA>
     <BBB>height: 0.5</BBB>
     <CCC>height: 1</CCC>
     <DDD>height: 2</DDD>
</source>

Graphotron Source

<graphotron xmlns="http://zvon.org/graphotron" xmlns:dot="http://zvon.org/graphotron/dot" >
     <vertex match="/*/AAA">
          <name select="."/>
     </vertex>
     <vertex match="/*/BBB">
          <name select="."/>
          <dot:height>0.5</dot:height>
     </vertex>
     <vertex match="/*/CCC">
          <name select="."/>
          <dot:height>1</dot:height>
     </vertex>
     <vertex match="/*/DDD">
          <dot:height>2</dot:height>
          <name select="."/>
     </vertex>
</graphotron>