calPixelOffset" EMPTY&gt;
        &lt;!-- The vertical position, in pixels, where the image should be
             rendered onto a raster display --&gt;
        &lt;!ATTLIST "VerticalPixelOffset" "value" #CDATA #REQUIRED&gt;
          &lt;!-- Data type: Integer --&gt;

      &lt;!ELEMENT "HorizontalScreenSize" EMPTY&gt;
        &lt;!-- The width, in pixels, of the raster display into which the
             image should be rendered --&gt;
        &lt;!ATTLIST "HorizontalScreenSize" "value" #CDATA #REQUIRED&g