Files in application/x-www-form+xml

• Base-64 encoded

• Added in a file element:

  <file name="photo" index="0" filename="egret.jpg" type="image/jpg">
    iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAMAAAAoyzS7AAAABGdBTUEAAK
    /INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwA
    AAAGUExURQD/AAAAAG8DfkMAAAAMSURBVHjaYmAACDAAAAIAAU9tWeEAAA
    ...
    AASUVORK5CYII=
   </file>