SMIL in SMIL?

Hi,

I have a question.

  Can a SMIL presentation include other SMIL presentation?

It seems possible, if referrences to SMIL document are supported in
`Media Object Element'. But two SMIL players (GRiNS and RealPlayer G2)
do not support SMIL document as a media type.

Thanks.

// seiki@flab.fujitsu.co.jp