Re: JSON-LD: Skipping keys, but parsing their contents

On Dec 15, 2013, at 3:44 AM, Alexander Dutton <alexander.dutton@it.ox.ac.uk> wrote:

> Morning,
> 
> I'm playing with adding extra bits to a HAL document
> (http://stateless.co/hal_specification.html), so that I can get some RDF
> linked data out of it. Here's an example HAL document:
> 
>> {
>>  "label": "happy",
>>  "_links": {
>>    "self": {"href": "http://example.com/happy"},
>>    "narrower": {"href": "http://example.com/ecstatic"}
>>  }
>> }
> 
> I can then extend this to look like:
> 
>> {
>>  "@context": {
>>    "skos": "http://www.w3.org/2004/02/skos/core#",
>>    "label": "skos:prefLabel",
>>    "narrower": "skos:narrower",
>>  },
>>  "@id": "http://id.example.com/happy",
>>  "@type": "skos:Concept",
>>  "label": "happy",
>>  "_links": {
>>    "self": {
>>      "@id": "http://id.example.com/happy",
>>      "href": "http://example.com/happy"
>>     },
>>    "narrower": {
>>      "@id": "http://id.example.com/ecstatic",
>>      "href": "http://example.com/ecstatic"
>>     },
>>  }
>> }
> 
> The point is that the document should still be meaningful to HAL
> clients, which can ignore the extra @context, @id and @type properties.
> 
> However, I don't know how to get a JSON-LD parser past the "_links" key.
> As far as we're concerned it's meaningless and its children could/should
> be included one level up (but that result in the document no longer
> being HAL). I thought {"@container": "@index"} might be the answer, but
> that means that /the current key has meaning, and its children don't/,
> which is the wrong way round for my use case.
> 
> Is there an answer?

Unfortunately, no. There is a way to cause a key to be used as an index, but it works at a level below _links, in this case (See Data Indexing [1]). We did spend some time considering such a mechanism, and it would have been useful in some other contexts, but it didn't end up being included in the 1.0 spec.

You might check out JSON-LD Macros [2] as a mechanism for massaging your data into place.

Gregg

[1] http://www.w3.org/TR/json-ld/#data-indexing
[2] https://github.com/antoniogarrote/json-ld-macros

> I realise I've missed the deadlines for commenting on the JSON-LD PR
> (http://www.w3.org/TR/json-ld/), so I hope it's me that's missed
> something as opposed to the functionality I want not being there.
> 
> Best regards,
> 
> Alex
> 
> -- 
> Alexander Dutton
> Linked Open Data Architect, Office of the CIO; data.ox.ac.uk, OxPoints
> IT Services, University of Oxford
> 
>

Received on Sunday, 15 December 2013 22:34:05 UTC