A Node-RED node that allows for the execution of SPARQL queries.
To install - change to your Node-RED user directory, which typically is:
cd ~/.node-red/node_modules
and copy-paste the node-red-contrib-sparql inside it!
Or
sudo npm install prokolyvakis/node-red-contrib-sparql --save
The endpoint block is used to set the SPARQL endpoint on which the query will be performed.
For example, it can be set to:
http://dbpedia.org/sparql
The query block is where the query should actually be written.
An example of a SPARQL query to the SPARQL endpoint mentioned above is the following:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?label
WHERE { <http://dbpedia.org/resource/Asturias> rdfs:label ?label }
By convention, the result of the query will be stored on:
msg['payload']