##proto @vr-proto-slide-element-line.wrl
  ##proto @vr-proto-slide-element-image.wrl
  ##proto @vr-proto-slide-element-vrml.wrl
  ##proto @vr-proto-slide-element-text.wrl
  ##proto @vr-proto-slide-element-break.wrl
  ##proto @vr-proto-slide-element-bullet.wrl
  ##proto @vr-proto-slide-element-nesting.wrl
  ##proto @vr-proto-slide-element-block.wrl