;!ELEMENT "BackgroundIndex" EMPTY&gt;
        &lt;!-- A palette index to be used as a background --&gt;
        &lt;!ATTLIST "BackgroundIndex" "value" #CDATA #REQUIRED&gt;
          &lt;!-- Data type: Integer --&gt;

      &lt;!ELEMENT "BackgroundColor" EMPTY&gt;
        &lt;!-- An RGB triple to be used as a background --&gt;
        &lt;!ATTLIST "BackgroundColor" "red" #CDATA #REQUIRED&gt;
          &lt;!-- The red background value --&gt;
          &lt;!-- Data type: Integer --&gt;
        &lt;!ATTLIST "Ba