The audio codecs allowed for the "snd" 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)
04/06/68 te
2994(3001)
Proposed Disposition of DIS 29500 Comment CO-0208 (Modified: 2008-01-03) Agreed; the description of this element would be improved by referencing a set of suggested formats, as was suggested for other similar items (e.g. image formats) in other national body comments. However, we believe that rather than duplicate this information, we should just reference the list defined in Part 1. The following changes will be made: Part 4, §4.6.68, pages 3,1383,139, attribute embed: embed (Embedded Audio File Relationship ID) Namespace: …/officeDocument/2006/relationships Specifies the identification information for an embedded audio file. This attribute is used to specify the location of an object that resides locally within the file. [Note: A list of suggested audio types is provided in Part 1, §15.2.2. end note] The possible values for this attribute are defined by the ST_RelationshipId simple type (§7.8.2.1). Also, we agree that this list should contain a set of portable codecs as the suggested base set; accordingly, the following changes will be made: Part 1, §15.2.16, page 157, row Content Type: Content Type: Any supported audio type. [Note: Some example content types are: audio/aiff http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm audio/midi http://www.midi.org/about-midi/specinfo.shtml audio/ogg http://xiph.org/vorbis/doc/Vorbis_I_spec.html audio/mpeg ISO/IEC 11172-3 audio/x-ms-wax http://msdn.microsoft.com/library/en-us/wmplay10/mmp_sdk/asx_elementsintro.asp end note]
