W3C home > Mailing lists > Public > public-vocabs@w3.org > October 2013

Re: Schema.org Actions - an update and call for review

From: Markus Lanthaler <markus.lanthaler@gmx.net>
Date: Fri, 18 Oct 2013 09:35:14 +0200
Message-ID: <5260E4B2.1090301@gmx.net>
To: 'Sam Goto' <goto@google.com>, public-hydra@w3.org, 'W3C Web Schemas Task Force' <public-vocabs@w3.org>
One more thing I realized after sending this message last night. Inline 
below

On 10/17/2013 09:20 PM, Markus Lanthaler wrote:
> On Thursday, October 17, 2013 8:39 PM, Sam Goto wrote:
>> For example, netflix can stream (http://schema.org/WatchAction) movies
>> (http://schema.org/Movie), but not *any* movie: it can stream a specific
>> set of movies that are in their *inventory* of streamable movies (e.g.
>> movies that in theatres right now are *not* in their inventory, movies
>> that can only be rented via DVDs either, etc).
>
> If there's a large number of instances which all support the same
> operations, it makes sense to create a separate class to communicate that
> information to the client. In the example above, that class could, e.g., be
> called StreamableMovie. The WatchAction can then simply be attached to that
> class. When talking to programmers without Semantic Web background I
> typically explain that in terms of interfaces an instance implements or
> inheritance similar to what they know from their object oriented programming
> languages.

Another option, and probably the one I would choose for such a use case, 
is to create a specific property which only appears in the data if the 
movie is streamable. The value of that property would be a URL that can 
be used to watch the movie:

{
   "@context": "http://purl.org/hydra/core/context.jsonld",
   "@id": "/a-movie",
   "title": "A streamable movie",
   "stream": "/streams/a-movie"
}

Just as with classes, you can also associate operations to properties:

{
   "@context": "http://purl.org/hydra/core/context.jsonld",
   "@id": "stream",
   "@type": "Link",
   "supportedOperations": [
     {
       "@type": "http://schema.org/WatchAction",
       "method": ...
       ...
     }
   ]
}


Cheers,
Markus


--
Markus Lanthaler
@markuslanthaler
Received on Friday, 18 October 2013 07:35:54 UTC

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