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Re: IRI Templates

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Fri, 21 Feb 2014 08:09:02 -0500
Message-ID: <53074FEE.9010403@openlinksw.com>
To: public-linked-json@w3.org
On 2/21/14 12:33 AM, David Booth wrote:
> Personally, I would prefer not to overload JSON-LD this way.  This 
> essentially amounts to a transformation rule.  And although 
> transformation rules are useful and neede, I would prefer to have them 
> specified as a separate layer.


> David Booth
> On 02/20/2014 08:50 PM, Gregg Kellogg wrote:
>> As part of work on the CSV WG, I've put forward the concept of CSV-LD
>> [1]. As I've discussed before, the idea is to use something like a
>> JSON-LD frame to map column values in a CSV to turn it into JSON-LD.
>> I discussed the idea of IRI Templates (really @id templates) on the
>> mailing list [2]. The idea is that fields in a CSV may be used to
>> identify entities, but they may not explicitly include an identifier.
>> In some cases, it may take two columns to determine a unique
>> identifier, for example when a database dump has a composite primary
>> key.
>> The idea I had is that one or more column values might be used to
>> create a template for an IRI or Blank Node. This concept might be
>> more generally useful for JSON-LD framing, but I wanted to get some
>> reaction from this list. From the email:
>> [[[ I've been hand-waving around this, but one way to do this might
>> be to extend the context definition to describe identifier
>> templates:
>> { "region_id": {"@id": "_:{Sales Region}", "@type": "@idTemplate"} }
>> I'm sure we can do much better, but the basic idea is that column
>> values can be used within a template used to construct an IRI or
>> BNode identifier, using some suitable rules. We could then use
>> "region_id" in the frame, with the understanding that it will be
>> expanded using the template defined in the context.
>> { "@id": "region_id", "@type": "ex:SalesRegion", "Sales Region":
>> null, "ex:period": { "@type": "ex:SalesPeriod", "Quarter": null,
>> "Sales": null } } ]]]
>> The idea would be that if a term is of type @idTemplate, it could be
>> used as a key or value (in this case, the value of @id), and it would
>> be processed based on other properties of the associated node ("Sales
>> Region" here). Obviously, this would require some normalization as
>> well, so that the result would be legal. A more complete example
>> would be the following:
>> { "@context": { "dc": "http://purl.org/dc/terms/", "rdf":
>> "http://www.w3.org/1999/02/22-rdf-syntax-ns#", "ex":
>> "http://example/", "Sales Region": "dc:title", "Quarter":
>> "dc:title", "Sales": "rdf:value", "region_id": {"@id": "_:{Sales
>> Region}", "@type": "@idTemplate"} }, "@id": "region_id", "Sales
>> Region": null, "ex:period": { "Quarter": null, "Sales": null } }
>> I suppose that filling in the template term would be part of
>> compaction, and the @idTemplate would allow such a term to be used as
>> the value of @id. This could presumably be done in a CSV-LD spec, but
>> it might be more generally useful as part of JSON-LD Framing.
>> Thoughts?
>> Gregg Kellogg gregg@greggkellogg.net
>> [1] https://www.w3.org/2013/csvw/wiki/CSV-LD [2]
>> http://lists.w3.org/Archives/Public/public-csv-wg/2014Feb/0119.html



Kingsley Idehen	
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Received on Friday, 21 February 2014 13:09:25 UTC

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