TTLIST "NumChannels" "value" #CDATA #REQUIRED&gt;
          &lt;!-- Data type: List of Integer --&gt;

      &lt;!ELEMENT "Gamma" EMPTY&gt;
        &lt;!-- The image gamma --&gt;
        &lt;!ATTLIST "Gamma" "value" #CDATA #REQUIRED&gt;
          &lt;!-- Data type: Float --&gt;

      &lt;!ELEMENT "BlackIsZero" EMPTY&gt;
        &lt;!-- True if smaller values represent darker shades --&gt;
        &lt;!ATTLIST "BlackIsZero" "value" ("TRUE" | "FALSE") "TRUE"&gt;

      &lt;!ELEMENT "Palette" (PaletteEntry)*&