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Re: data interchange format

From: Felix Sasaki <fsasaki@w3.org>
Date: Wed, 14 Jan 2009 00:32:20 +0900
Message-ID: <496CB404.7010401@w3.org>
To: Joakim Söderberg <joakim.soderberg@ericsson.com>
CC: public-media-annotation@w3.org

Hi Joakim,

I tried a different approach which is again not specific to a format 
(JSON / RDF / XML / ...). It is an update of the XSLT implementation, 
but that is replacable.

I updated
http://www.w3.org/People/fsasaki/annotation-mappings/
to contain a property "dateGeneral", in addition to "pubdate". 
"dateGeneral" encompasses both "pubdate" and other kinds of dates, e.g. 
"modification date". So querying a feed using the property "dateGeneral" 
gives you a superset of the results of "pubdate". See e.g.
http://www.w3.org/People/fsasaki/annotation-mappings/query/q?inputURI=http%3A%2F%2Fgdata.youtube.com%2Ffeeds%2Fbase%2Fvideos%2F-%2FExperte%3Fclient%3Dytapi-youtube-browse%26v%3D2&property=pubdate
vs.
http://www.w3.org/People/fsasaki/annotation-mappings/query/q?inputURI=http%3A%2F%2Fgdata.youtube.com%2Ffeeds%2Fbase%2Fvideos%2F-%2FExperte%3Fclient%3Dytapi-youtube-browse%26v%3D2&property=dateGeneral

I like the levels of granularity you describe DC > EXIF > XMP, but I'm 
not sure if you need a specific format to achieve that. The granularity 
description itself is enough to achieve the effect you want, see above 
implementation. And a format would create the burden that it must be 
implemented by tools who normally don't process Jason, e.g. browsers.

Felix

Joakim Söderberg さんは書きました:
> Hello,
> The way I see it, is that the definition of the data interchange format [1] is part of the API and therefore important. 
>
> If we define a flexible format (like JSON) we could define type-value pairs or an array thereof which defines what you get (preferably in a simple way). It could solve the granularity problem i.e. "dc:rights vs. xmpDM:copyright" by informing what attribute is referred e.g. [Disney,dc:rights] [Walt Disney Company ,xmpDM:copyright].  
>
> We could define what a valid array should look like:
> [(value, attribute), (value, attribute),..., (value, attribute)]
>
> - and valid values for "value" and "attribute" in BNF for example.
>
> The ontology could then perhaps define the levels of granularity e.g. (from top to bottom) DC -> EXIF -> XMP being the order of the elements in the array, similar to the schema of preference defined by the Metadata Working Group.
>
> Just some thoughts to get the discussion going...
> /Joakim
>
>
> [1] http://www.w3.org/2008/WebVideo/Annotations/wiki/Dataformat
>
>
>   
Received on Tuesday, 13 January 2009 15:32:59 GMT

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