Re: Checking equality of graphs serialized in JSON-LD and Turtle

On 10/19/2014 09:50 AM, Melvin Carvalho wrote:
> 
> 
> On 18 October 2014 23:03, ☮ elf Pavlik ☮ <perpetual-tripper@wwelves.org
> <mailto:perpetual-tripper@wwelves.org>> wrote:
> 
>     On 10/18/2014 11:59 AM, bergi wrote:
>     > Am 17.10.2014 um 15:35 schrieb ☮ elf Pavlik ☮:
>     >> Howdy,
>     >>
>     >> I work on automated tests for examples in draft of
>     ActivityStreams 2.0
>     >> spec[1]
>     >>
>     >> So far I use jsonld.js to get N-Quads from JSON-LD examples in spec +
>     >> latest context document. For now I modified those N-Quads by hand to
>     >> make it more human readable Turtle so we can review and define
>     expected
>     >> RDF as fixtures.
>     >>
>     >> I still don't have clear strategy how to compare graphs serialized in
>     >> both JSON-LD and Turtle. I plan to use N3.js to parse turtle, also in
>     >> LevelGraph extensions[2][3] we already have code which converts both
>     >> serializations to array of plain triples for persisting them. It may
>     >> require some carefulness with blank nodes...
>     >>
>     >> I remember us having conversation about common js format which we
>     could
>     >> use as common base for converting all the other serializations. I
>     think
>     >> we considered expanded JSON-LD as main candidate.
>     >>
>     >> Any recommendations for quick way of comparing, for now just
>     equality,
>     >> graphs serialized in JSON-LD and Turtle?
>     >
>     > I have created the module rdf-test-utils[1] for my RDF-Ext
>     tests[2]. The
>     > module contains a compareGraph method to compare two RDF-Interfaces
>     > graph objects. The jsonld.normalize function is used to generate
>     > canonical N-Triples. You could use the RDF-Ext parsers to get
>     > RDF-Interfaces graph objects. Internal RDF-Ext also uses the
>     JSON-LD and
>     > N3.js library.
>     neat! it almost solved my task, but then *blank node identifiers* jumped
>     at me and after normalizing graphs it compared '' with '' returning
>     true :D
>     https://github.com/bergos/rdf-ext/issues/3
> 
> 
> Dont use bnodes, you are violating axiom 0 of the web (among others!),
> anything of significance should be given a URI.

Melvin, IMO *sometimes* they do make sense, still all the time
triggering debates:
* http://lists.w3.org/Archives/Public/semantic-web/2014Sep/0101.html
* http://lists.w3.org/Archives/Public/semantic-web/2014Sep/0106.html
* http://manu.sporny.org/2013/rdf-identifiers/#comment-3369

Anyways, once we patch RDF-Ext I can compare equality of graphs with
blank nodes and normalized to JSON-LD, this way I address current state
of things :)

* http://www.w3.org/2001/sw/wiki/How_to_diff_RDF#Some_Related_Papers
* http://www.w3.org/DesignIssues/Diff

Received on Sunday, 19 October 2014 09:24:21 UTC