XML Source

<source>
     <yellow>yellow</yellow>
     <yellowgreen>yellowgreen</yellowgreen>
     <orange>orange</orange>
</source>

Graphotron Source

<graphotron xmlns:dot="http://zvon.org/graphotron/dot" xmlns="http://zvon.org/graphotron" >
     <vertex match="/*/yellow">
          <name select="."/>
          <dot:fontcolor>yellow</dot:fontcolor>
     </vertex>
     <vertex match="/*/yellowgreen">
          <name select="."/>
          <dot:fontcolor>yellowgreen</dot:fontcolor>
     </vertex>
     <vertex match="/*/orange">
          <name select="."/>
          <dot:fontcolor>orange</dot:fontcolor>
     </vertex>
</graphotron>