any X-Window colorname (lib/rgb.txt in X11 directory)

any RGB color specification in a format like "#0f331e"

XML Source

<source>
     <yellow>yellow</yellow>
     <green>green</green>
     <rgb>#99AAFF</rgb>
</source>

Graphotron Source

<graphotron xmlns:daVinci="http://zvon.org/graphotron/daVinci" xmlns="http://zvon.org/graphotron" >
     <vertex match="/*/yellow">
          <name select="."/>
          <daVinci:COLOR>yellow</daVinci:COLOR>
     </vertex>
     <vertex match="/*/green">
          <name select="."/>
          <daVinci:COLOR>green</daVinci:COLOR>
     </vertex>
     <vertex match="/*/rgb">
          <name select="."/>
          <daVinci:COLOR>#99AAFF</daVinci:COLOR>
     </vertex>
</graphotron>