Re: Changes in Community Group Drafts Targeted for 1.1 · json-ld/json-ld.org Wiki

It would be great to move that discussion to an issue on the json-ld github
repository, instead of in a pull request on a particular implementation
where it will disappear once the PR is accepted or rejected :)

Rob

On Mon, Jan 29, 2018 at 11:06 AM, Kingsley Idehen <kidehen@openlinksw.com>
wrote:

> On 1/29/18 12:29 PM, Gregg Kellogg wrote:
>
> Hi Kingsley, did you try it on the new development playground: [1]. You
> should also be able to run it on my own distiller: [2].
>
> The reason the “databaseId” is not transformed is that JSON-LD separates
> the concept of “document base” and “vocabulary base”. JSON Keys are
> interpreted as IRIs relative to the vocabulary base, which is not
> established in the context, so it is dropped. Try adding "@vocab": "
> http://example/“ to the context:
>
> {"@context":
>   {
>      "schema": "http://schema.org/",
>     "@base": "#",
>     "@vocab": "http://example/"
>   },
>     "@id": "#BrewEats",
>     "@type": "schema:Restaurant",
>     "schema:name": "Brew Eats",
>     "databaseId": "23987520"
> }
>
> There is (currently) now way to say that the vocabulary base is the same
> as the document base, which seems to be what you’re after. Given a suitable
> syntax, this is something that could be considered for the 1.1 work. Note,
> this is pretty much the same as Issue #488 [3], addressed in PR #573 [4].
>
> Note that these are all serialization issues; in the case of Turtle and
> other serializations, relative IRIs are always relative to the document
> base (although RDFa does have an @vocab attribute), but this was not
> practical in the design of JSON-LD (at least, as considered in the 1.0
> timeframe). As you know, the RDF datamodel does not support relative IRIs,
> that is an interpretation of concrete serializations.
>
> Gregg Kellogg
> gregg@greggkellogg.net
>
> [1] https://json-ld.org/playground-dev/
> [2] http://rdf.greggkellogg.net/distiller?command=expand&
> format=jsonld&output_format=jsonld
> [3] https://github.com/json-ld/json-ld.org/issues/488
> [4] https://github.com/json-ld/json-ld.org/pull/573
>
>
> Gregg,
>
> As per our evolving thread on github [1], and as you have correctly
> discerned, I want to use relative IRIs (specifically, HTTP URIs) to denote
> predicates in my RDF sentences/statements. Doing that is perfectly legal
> RDF, and mandatory for any notation (or concrete syntax) that's associated
> with RDF usage in line with Linked Data principles.
>
> "A concrete RDF syntax
> <https://www.w3.org/TR/rdf11-concepts/#dfn-concrete-rdf-syntax> may offer
> many different ways to encode the same RDF graph
> <https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-graph> or RDF dataset
> <https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset>, for example
> through the use of namespace prefixes
> <https://www.w3.org/TR/rdf11-concepts/#dfn-namespace-prefix>, relative
> IRIs, blank node identifiers
> <https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node-identifier>, and
> different ordering of statements. While these aspects can have great effect
> on the convenience of working with the RDF document
> <https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-document>, they are not
> significant for its meaning." -- https://www.w3.org/TR/rdf11-
> concepts/#fromThisDocument.
>
> Thus, based on the above, I can only conclude that at the current time
> JSON-LD is a concrete RDF syntax that doesn't support denotation of RDF
> sentence/predicates using relative IRIs i.e., all predicates MUST be
> denoted using absolute IRIs.
>
>
> Links:
>
> [1] https://github.com/digitalbazaar/jsonld.js/pull/
> 225#issuecomment-361336284 -- Issues Thread for this matter
>
> [2] https://www.quora.com/What-is-the-Semantic-Web/answer/
> Kingsley-Uyi-Idehen -- kind of example that I can't currently replicate
> using JSON-LD.
>
> Kingsley
>
>
> On Jan 27, 2018, at 6:34 PM, Kingsley Idehen <kidehen@openlinksw.com>
> wrote:
>
> On 1/26/18 7:50 PM, Gregg Kellogg wrote:
>
> I summarized information from the TPAC presentation into a wiki page maintained on the json-ld.org repo [1].
>
> Gregg Kellogggregg@greggkellogg.net
>
> [1] https://github.com/json-ld/json-ld.org/wiki/Changes-in-Community-Group-Drafts-Targeted-for-1.1
>
>
>  Hi Gregg,
>
> I still can't get the following to parse correctly via JSON-LD playground
> or anywhere else.  {
>
>   "@context":
>   {
>      "schema": "http://schema.org/" <http://schema.org/>,
>     "@base": "#"
>   },
>     "@id": "#BrewEats",
>     "@type": "schema:Restaurant",
>     "schema:name": "Brew Eats",
>     "databaseId": "23987520"
> }
>
> What is the JSON-LD equivalent for the following RDF-Turtle statement collection,
> Where the rendered output does not exclude <#databaseId> key and "23987520" value?
>
>
> @prefix schema: <http://schema.org/> <http://schema.org/>.
>
> <#BrewEats>
> a schema:Restaurant;
> schema:name "Brew Eats";
> <#databaseId> "23987520".
>
>
> --
> Regards,
>
> Kingsley Idehen 
> Founder & CEO
> OpenLink Software   (Home Page: http://www.openlinksw.com)
>
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>
>
>
> --
> Regards,
>
> Kingsley Idehen 
> Founder & CEO
> OpenLink Software   (Home Page: http://www.openlinksw.com)
>
> Weblogs (Blogs):
> Legacy Blog: http://www.openlinksw.com/blog/~kidehen/
> Blogspot Blog: http://kidehen.blogspot.com
> Medium Blog: https://medium.com/@kidehen
>
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>
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>         : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
>
>


-- 
Rob Sanderson
Semantic Architect
The Getty Trust
Los Angeles, CA 90049