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Re: schema.org proposal for extending Thing

From: Raj Singh <rsingh@opengeospatial.org>
Date: Wed, 10 Apr 2013 13:37:41 -0400
Message-Id: <E0E31BDA-900C-47C7-8194-6DE6F4578CF7@opengeospatial.org>
Cc: "public-vocabs@w3.org" <public-vocabs@w3.org>
To: "kcoyle@kcoyle.net" <kcoyle@kcoyle.net>
I had two proposals. One was category and the other was related link. sameThingAs is one type of related link -- the most important type IMHO. So I agree it does not replace the need for category. I still suggest adding that property to Thing. 


On Apr 10, 2013, at 11:40 AM, Karen Coyle <kcoyle@kcoyle.net> wrote:

> On 4/9/13 3:40 PM, Raj Singh wrote:
>> Reading the sameThingAs property [1], I do think that would serve
>> mainly the same purpose. Thing/link as I described it would be more
>> general, allowing for more types of relationships between the
>> resource and the link, but honestly, I think sameThingAs covers most
>> requirements.
> I see a difference between the identification role of sameThingAs and Raj's proposal for a property that can be used to categorize something. This is based on my assumption that a category for the church named "Sagrada Familia" might be a link to the wikipedia category "Churches in Barcelona" or the geonames code "CH" for "church." If sameThingAs also exists as a property, then the link to dbpedia:Sagrada_familia would use that property.
> I wouldn't expect to see sameThingAs -> geonames:CH.
> Raj, have I understood your meaning of "category"?
> kc
>> I don't think Thing/url could be made to work for this purpose. You
>> could do some mark up like that below, but the semantics would be too
>> vague to do anything with it.
>> <div itemscope itemtype="http://schema.org/Place"> <p
>> class="headline" itemprop="name">First Baptist Church in America</p>
>> <a href="picinside.html" itemprop="url">Here is a picture inside the
>> church</url> <a href="picback.html" itemprop="url">Here is a picture
>> of the back of the church</url> <a href="church.rdf"
>> itemprop="url">This is some RDF about the church</url> </div>
>> Just the fact that they are called out as "urls" about the place
>> could tell  you that there's some relationship (but the documentation
>> would have to make this clear) between the Thing and its child "url"
>> properties. Is that enough semantics for the schema.org mission?
>> Until now I didn't think it was, but maybe it is. It's a good debate
>> to have...
>> [1] http://www.w3.org/wiki/WebSchemas/ThingIdentity
>> --- Raj The OGC: Making location count.
>> http://www.opengeospatial.org/ogc/organization/staff/rsingh
>> On Apr 9, at 5:55 PM, Justin Boyan <jaboyan@google.com> wrote:
>>> Raj, re your second proposal, can you clarify the difference
>>> between Thing/link, the existing Thing/url, and the object's id
>>> (microdata @itemid, RDFa @about)? Would Thing/link serve the same
>>> purpose as the proposed sameThingAs property?
>>> Thanks, Justin
>>> On Tue, Apr 9, 2013 at 5:03 PM, Raj Singh
>>> <rsingh@opengeospatial.org> wrote: I'm developing schema.org schema
>>> for points of interest (POIs), based on a lot of work on a
>>> conceptual model [1]. I've created an initial implementation using
>>> existing schema.org vocabulary -- particularly the Place object
>>> [2].
>>> Two things seem to be omitted from the core schema, which are key
>>> components of our POI model. First is the idea of categorization,
>>> or freeform tagging, such as is present in the Atom category
>>> element [3]. This is a concept used in the POI model, but seems
>>> incredibly useful for any type of object, and therefore I believe
>>> category should be a property of Thing.
>>> Second is the idea of related links. The concept of identifying
>>> related resources is a widespread requirement present in most
>>> information architectures. HTML has it [4]. Atom has it [5].
>>> Semantic technology such as RDF is practically based on it. Why not
>>> schema.org? In the POI work, we adopted the IANA link relation
>>> types [6], but we weren't totally happy with those. Doesn't it seem
>>> like schema.org's Thing needs a link property?
>>> [1] http://www.w3.org/2010/POI/wiki/Data_Model [2]
>>> http://openpois.ogcnetwork.net/pois/51f2e335-781e-4651-bfe2-d54682238919
> [3] http://www.atomenabled.org/developers/syndication/#category
>>> [4]
>>> http://www.w3.org/TR/1999/REC-html401-19991224/struct/links.html#h-12.3
> [5] http://www.atomenabled.org/developers/syndication/#link
>>> [6]
>>> http://www.iana.org/assignments/link-relations/link-relations.xml
>>> --- Raj The OGC: Making location count.
>>> http://www.opengeospatial.org/ogc/organization/staff/rsingh
> -- 
> Karen Coyle
> kcoyle@kcoyle.net http://kcoyle.net
> ph: 1-510-540-7596
> m: 1-510-435-8234
> skype: kcoylenet
Received on Wednesday, 10 April 2013 17:38:12 UTC

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