On 12/4/13 10:13 AM, Thomas Steiner wrote:
Dear Public-LOD,As different Web browsers support different video codecs, with Web video it is not uncommon to see things like the below (simplified for legibility reasons)… <video> <source src="./video.ogv" type="…"> <source src="./video.mp4" type="…"> </video> When I want to make statements about the video in question, I have the problem that the "same" video has two different URIs ([…].mp4, […].ogv). So I have to say ("ma:" from the Ontology for Media Resources [0])… <http://ex.org/video.ogv> a ma:MediaResource . <http://ex.org/video.ogv> ma:title "Sample Video" . <http://ex.org/video.ogv> ma:description "Sample Description" . …and also… <http://ex.org/video.mp4> a ma:MediaResource . <http://ex.org/video.mp4> ma:title "Sample Video" . <http://ex.org/video.mp4> ma:description "Sample Description" . Essentially (unless I wanted to introduce something more complex) I am forced to duplicate all statements I make about both video resources, where actually I would like to make statements about the video no matter its encoding. Long story short, is it too much of a stretch to just say… <http://ex.org/video.mp4> owl:sameAs <http://ex.org/video.ogv> …as to avoid the problem? One issue I see is that, e.g., ma:format (which makes statements about the MIME type) obviously does not hold true for both media resources as their MIME types are different. The implicit (as I read the spec at least) semantics of <video> are that the given alternatives in the various <source>-s should be the "same" video, just in different encodings. What I actually wanted would be something like a canonical URI [1] for a video like <http://ex.org/video>, so that one could make statements based on its canonical URI that would hold true for all representations in different encodings… <http://ex.org/video> a ma:MediaResource . <http://ex.org/video> ma:title "Sample Video" . <http://ex.org/video> ma:description "Sample Description" . …which would hold true for <http://ex.org/video.ogv> and <http://ex.org/video.mp4>. Thanks for your thoughts. Best, Tom -- [0] http://www.w3.org/TR/mediaont-10/ [1] https://support.google.com/webmasters/answer/139394?hl=en
Tom <http://ex.org/video.mp4> denotes one entity. <http://ex.org/video.ogv> denotes another.Both encode recordings of some event. Thus, they are connected (related) by the event(s) the capture, and the relation (connection) in question can't be:
<http://ex.org/video.mp4> owl:sameAs <http://ex.org/video.ogv> . It would be more like: <http://ex.org/video.mp4> foaf:topic <#CapturedEventNameX>. <http://ex.org/video.ogv> foaf:topic <#CapturedEventNameX>.Which ultimately enables one determine that <#CapturedEventNameX> was captured on video; and that the where the videos in question have different encoding.
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