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Knowboard

SPARQL

Knowboard uses the SPARQL language to query and modify data in the Knowledge Graph.

Querying

Section titled “Querying”

SPARQL files

Section titled “SPARQL files”

Files with .rq or .sparql extensions are detected as SPARQL queries.

Markdown embedding

Section titled “Markdown embedding”

Queries can also be embedded in Markdown code blocks with sparql specified as the language:

```sparql
SELECT * WHERE {}
```

Running queries

Section titled “Running queries”

The Language Server Protocol is currently limited in features to display query results, so read queries must be executed in the browser or another client.

SPARQL queries will display a CodeLens ▶ Open in SPARQL UI to open the built-in web-based query tool in a browser.

Updates

Section titled “Updates”

Update queries can be either through a browser or other client, like read queries. However, they can also be run directly in the editor with the ⚡️ Apply Update Code Lens.

The results of the update will appear as unsaved “edits” to the affected files.

Clients

Section titled “Clients”

The Knowboard SPARQL server is compatible with a variety of standard clients.

Comunica

Section titled “Comunica”

https://comunica.dev/docs/query/getting_started/query_cli/

Terminal window
$ npm install -g @comunica/query-sparql
$ comunica-sparql http://localhost:7878/sparql \
  -t table 'SELECT ?s ?p ?o WHERE { ?s ?p ?o }'