XML Source

<source>
     <helvetica_bold/>
     <helvetica/>
     <times_roman/>
     <courier/>
</source>

Graphotron Source

<graphotron xmlns="http://zvon.org/graphotron" xmlns:dot="http://zvon.org/graphotron/dot" >
     <vertex match="/*/helvetica_bold">
          <name select="name()"/>
          <dot:fontname>Helvetica-Bold</dot:fontname>
     </vertex>
     <vertex match="/*/times_roman">
          <name select="name()"/>
          <dot:fontname>Times-Roman</dot:fontname>
     </vertex>
     <vertex match="/*/helvetica">
          <name select="name()"/>
          <dot:fontname>Helvetica</dot:fontname>
     </vertex>
     <vertex match="/*/courier">
          <dot:fontname>Courier</dot:fontname>
          <name select="name()"/>
     </vertex>
</graphotron>