With regard to multifile protocols and multipart MIME, one reason for the example syntax: <a type="video/ogg" href="torrent+http://example.com/example3.ext.torrent";>Example</a> when a multifile protocol's referenced object contains one file, instead of: <a type="multipart/mixed" href="torrent+http://example.com/example3.ext.torrent";>Example <link rel="part" type="video/ogg"/></a> is readability; however, the two could be interchangeable, definitionally, for multifile protocols where one file is contained by the multifile resource. While either or both could be of use for multimedia scenarios, the following example intends to illustrate readability: <video> <source type="type="video/ogg" src="torrent+http://example.com/example3.ext.torrent"/></video> where the example torrent file contains one video file. Also, it occurs that media fragment URI is compatable with the indicated torrent protocol. For a torrent containing one multimedia file, the media fragments URI could describe an interval of that multimedia file with: torrent+http://example.com/example4.ext.torrent#t=10,20 Which describes an interval of the multimedia object. Let us consider that a particular file inside of a torrent containing multiple files can be referenced with: torrent+http://example.com/example4.ext.torrent#file=video.ogg as per <a type="video/ogg" href="torrent+http://example.com/example4.ext.torrent#file=video.ogg";>Example</a> where the example torrent contains more than one file, but one file is indicated in the URL. An example usage scenario to illustrate that is where a video and its tracks are in one torrent: <video> <source type="type="video/ogg" src="torrent+http://example.com/example4.ext.torrent#file=video.ogg"/> <track type="text/vtt" kind="subtitles" src="torrent+http://example.com/example4.ext.torrent#file=captions-en.vtt"/></video> Illustrating the combination of referencing a file in a torrent and media fragments URI: <video> <source type="type="video/ogg" src="torrent+http://example.com/example4.ext.torrent#file=video.ogg&t=10,20"/> <track type="text/vtt" kind="subtitles" src="torrent+http://example.com/example4.ext.torrent#file=captions-en.vtt"/></video> The segmented downloading, in that example, only requires the pieces of those two files from the torrent to play the described interval of video while also having the captions track for that interval. A more advanced example: <video> <source type="type="video/ogg" src="torrent+http://example.com/example4.ext.torrent#file=video.ogg&t=10,20"/> <source type="type="video/mpeg" src="torrent+http://example.com/example4.ext.torrent#file=video.mpg&t=10,20"/> <track type="text/vtt" kind="subtitles" srclang="en" src="torrent+http://example.com/example4.ext.torrent#file=captions-en.vtt"/> <track type="text/vtt" kind="subtitles" srclang="es" src="torrent+http://example.com/example4.ext.torrent#file=captions-es.vtt"/> <track type="text/vtt" kind="subtitles" srclang="fr" src="torrent+http://example.com/example4.ext.torrent#file=captions-fr.vtt"/></video> The concepts of multifile protocols extend beyond the useful example protocol of torrent. Implementation for multifile protocols, such as "torrent+http://";, would be reusable for other multifile protocols. Multipart MIME is a means of describing the MIME types of the multiple files in multifile protocol scenarios. Kind regards, Adam Sobieski
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