Zvon SMIL 2.0 reference - element switch

ZVON > References > SMIL 2.0 Reference

Element:	switch
Attributes:	\| alt \| class \| customTest \| id \| longdesc \| system-bitrate \| system-captions \| system-language \| system-overdub-or-caption \| system-required \| system-screen-depth \| system-screen-size \| systemAudioDesc \| systemBitrate \| systemCaptions \| systemComponent \| systemCPU \| systemLanguage \| systemOperatingSystem \| systemOverdubOrSubtitle \| systemRequired \| systemScreenDepth \| systemScreenSize \|

The switch element allows an author to specify a set of alternative elements from which only the first acceptable element is chosen.