- From: Martin Hepp <martin.hepp@ebusiness-unibw.org>
- Date: Wed, 9 Oct 2013 18:30:19 +0200
- To: Ed Summers <ehs@pobox.com>
- Cc: Dan Brickley <danbri@google.com>, jean delahousse <delahousse.jean@gmail.com>, Guha <guha@google.com>, Thad Guidry <thadguidry@gmail.com>, Aaron Bradley <aaranged@gmail.com>, Bernard Vatant <bernard.vatant@mondeca.com>, PublicVocabs <public-vocabs@w3.org>
On Oct 9, 2013, at 4:31 PM, Ed Summers wrote:
> On Wed, Oct 9, 2013 at 10:20 AM, Dan Brickley <danbri@google.com> wrote:
>> Merely saying that a property expects an URL doesn't really cut it,
>> since most non-literal-valued properties can usefully take URLs...
>
> Can you (briefly) describe how it doesn't "cut it" to allow something
> like schema:occupationalCategory to point at a resource using a URL?
>
Three use-cases:
1. The site may not be able to include the authoritative URI of such a concept because it may lack the respective data.
2. Search engines will typically index only content from HTML-based resources, so they will not dereference such URLs and thus lack hierarchy information etc.
3. A vocabulary from the same site / domain / namespace may be more useful for a search engine due to the provenance information - the engine could apply a wealth of techniques for ranking and filtering to the vocabulary (e.g. consider only vocabularies that reach a certain PageRank threshold etc.).
I do not know how Google works, but a assume that a category URL will in most cases just be a string for Google, while a pointer to another schema.org element on the same site may allow more advanced processing. (Note that Google is a largely distributed system, so if you can limit the scope of relevant data to such from the same site, you can distribute its storage and processing with ease).
Martin
--------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen
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Received on Wednesday, 9 October 2013 16:30:57 UTC