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Re: Proposal: Audiobook

From: Dan Brickley <danbri@google.com>
Date: Mon, 30 Sep 2013 20:27:44 +0100
Message-ID: <CAK-qy=6iRFdR7DYMqbuCRtwAKr8-=QqtnmjbOuHfTCcgDf6R8g@mail.gmail.com>
To: Karen Coyle <kcoyle@kcoyle.net>
Cc: "Wallis,Richard" <Richard.Wallis@oclc.org>, Guha <guha@google.com>, W3C Vocabularies <public-vocabs@w3.org>
On 30 September 2013 20:24, Karen Coyle <kcoyle@kcoyle.net> wrote:
> On 9/30/13 11:24 AM, Dan Brickley wrote:
>> On 30 September 2013 19:15, Wallis,Richard <Richard.Wallis@oclc.org>
>> wrote:
>>> Is this not why  'additionalType' was added to Thing?
>> Yes: Microdata has trouble with the idea of describing an item using
>> multiple independently defined types:
>> " Multiple types defined to use the same vocabulary can be given for a
>> single item by listing the URLs as a space-separated list in the
>> attribute' value. An item cannot be given two types if they do not use
>> the same vocabulary, however." --
>> http://www.whatwg.org/specs/web-apps/current-work/multipage/microdata.html#typed-items
>> Rather than trying to gradually turn Microdata into something that it
>> isn't (i.e. back into RDFa), the schema.org team decided instead to
>> add the additionalType property.
> I had understood the "additionalType" as mainly having a function of
> categorization -- this thing is both an apple and a fruit. Does the use of
> an additionalType that is a schema.org type provide access to all of the
> properties of the additionalType?

It is purely another way of writing rdf:type. Any pair of things that
are related by rdf:type could equally well be described as being
related by schema:additionalType. In the sense that RDF's
types/classes are useful for categorisation, then so is this
mechanism. But maybe there's a subtle difference in how you're using
the word 'categorize' that I'm not picking up on?

Received on Monday, 30 September 2013 19:28:12 UTC

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