The audio codecs allowed for the "audio" element are not specified. There are many propietary and non-portable codecs which would break portability of a document.

Define a set of patent-free portable audio codecs as base. Whenever other codecs are used, the document must be marked as "extended" (see comment for Part 1, Section 2.6)

04/06/09 te

3083(3090)

Proposed Disposition of DIS 29500 Comment CO-0207 (Modified: 2008-01-03) The audio element does not specify the actual audio file which is used by the animation; as such, we do not believe that it needs a list of potential codecs. To clarify the semantics of this element, the following changes will be made in Part 4, §4.6.9, page 3,083, lines 8­19: This element is used to include audio during an animation. This element specifies that this node within the animation tree triggers the playback of an audio file; the actual audio file used is specified by the sndTgt element (§4.6.70). [Example: Consider adding applause sound to an animation sequence. The <audio> element is used as follows: <p:cTn ... > <p:stCondLst>... </p:stCondLst> <p:childTnLst>... </p:childTnLst> <p:subTnLst> <p:audio> <p:cMediaNode vol="11000"> <p:tgtEl> <p:sndTgt r:embed="rId2" /> </p:tgtEl> ... </p:cMediaNode> </p:audio> </p:subTnLst> </p:cTn> The audio element specifies the location of the audio playback within the animation; its child sndTgt element specifies that the audio to be played is the target of the relationship with ID rId2 . E e nd example]