SPARQL UPDATE queries over jsonld files stored in SOLID?

[aorumbayev]

Hello,

I was wondering if it is possible to execute SPARQL UPDATE queries over jsonld files in solid ? From what I have tried so far, I only had success with .ttl files.

Some additional things I've tried: • Comunica sparql works great for search queries over jsonld files in solid but they don't support update queries :/ All I want is a plain simple ability to rename some string properties in the files without removing the whole jsonld and adding it back.

• Using Rdflib, I tried serialising jsonld to turtle, storing it on solid as turtle and every time I fetch it I would then serialise it back to jsonld when I fetch it. However it produces the error and can't parse it back to jsonld (Error translating between RDF formats)

Reference to more detailed issue description on SOLID Community Forum

[jaxoncreed]

Node solid server does not currently support SPARQL. It's best to read the file into your client, perform SPARQL manipulations there, then write it back to the server.

[aorumbayev]

@jaxoncreed thanks for letting me know, ill be waiting for the support to roll out then :)

I wonder if inrupt.net uses the instance of node-solid-server because I was apple to execute a Sparql update via Patch request to a .ttl file stored in a pod provided by inrupt.

[jaxoncreed]

It does not. Were you using communica? I believe communica has built-in client-side SPARQL.

[aorumbayev]

@jaxoncreed hmm, this is strange,

No I just send a direct PATCH request with Postman here is the example

curl -X PATCH \
  https://aorumbayevv2.inrupt.net/wed22/configurations/test.ttl \
  -H 'Content-Type: application/sparql-update' \
  -H 'Postman-Token: add1d4f1-a833-4a13-9915-e69c106fb8de' \
  -H 'cache-control: no-cache' \
  -d '@prefix lpa: <https://w3id.org/def/lpapps#> .

DELETE 
{ ?subject lpa:title ?test . }
INSERT
{ ?subject lpa:title "Copper Davidfield" . }
WHERE
{ ?subject lpa:title ?test }
'

[jaxoncreed]

Well... Looks like it does have a SPARQL parser (https://github.com/solid/node-solid-server/blob/master/lib/handlers/patch.js#L18)

I wouldn't trust this 100% though, it's not something we're actively supporting at the moment. In the future, it will be.

[aorumbayev]

@jaxoncreed do you guys have some kind of a implementation roadmap that other developers using the node-solid-server could track while awaiting for new features ?

Also I think it would have been great to include minor descriptions into Github releases to see what's new in that release.

[jaxoncreed]

At the moment node-solid-server does not have a roadmap. Any new pull requests are welcome and if you want to stress a need for something I encourage you to join our community meetings https://www.w3.org/community/solid/wiki/Meetings