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

On 17 October 2014 16:45, Markus Lanthaler <markus.lanthaler@gmx.net> wrote:

> On 17 Okt 2014 at 15:35, ☮ elf Pavlik ☮ wrote:
> > Any recommendations for quick way of comparing, for now just equality,
> > graphs serialized in JSON-LD and Turtle?
>
> It depends on whether you have blank nodes in the document or not. If you
> don't simply convert it to N-Triples, sort the triples and do a string
> comparison.
>

Yes, you have to do this in a certain way.  Remove all whitespace and have
exactly one space between the object an the .


>
> If you do have blank nodes, it becomes a bit more complex as you need to
> ensure that the bnodes get assigned the same bnode identifiers. We have
> been working on a graph normalization algorithm in the JSON-LD CG [1].
> Luckily, jsonld.js implements this algorithm (also the JSON-LD playground
> supports it, just click on the normalize tab). After normalizing both
> graphs it is trivial to compare them.
>

In node try something like:

var jsonld = require('jsonld');

jsonld.normalize(doc, {format: 'application/nquads'}, function(err,
normalized) {

  // do something here


});

What I commonly do with a normalized doc is take the sha256 and use
that for the @id.  In this way you can compare ID's and know that the
data is the same.






>
>
> HTH,
> Markus
>
>
> [1] http://json-ld.org/spec/latest/rdf-graph-normalization/
>
>
> --
> Markus Lanthaler
> @markuslanthaler
>
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