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Comunica query engine support for the LDflex language
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LDflex/LDflex-Comunica
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This library lets you usetheComunica query enginewith theLDflex language.
npm install ldflex @ldflex/comunica
const{ PathFactory}=require('ldflex');const{default:ComunicaEngine}=require('@ldflex/comunica');const{ namedNode}=require('@rdfjs/data-model');// The JSON-LD context for resolving propertiesconstcontext={"@context":{"@vocab":"http://xmlns.com/foaf/0.1/","friends":"knows",}};// The query engine and its sourceconstqueryEngine=newComunicaEngine('https://ruben.verborgh.org/profile/');// The object that can create new pathsconstpaths=newPathFactory({ context, queryEngine});asyncfunctionshowPerson(person){console.log(`This person is${awaitperson.name}`);console.log(`${awaitperson.givenName} is friends with:`);forawait(constnameofperson.friends.givenName)console.log(`-${name}`);}construben=paths.create({subject:namedNode('https://ruben.verborgh.org/profile/#me'),});showPerson(ruben);
This example uses the comunica engine for local file queries.
const{ PathFactory}=require('ldflex');const{default:ComunicaEngine}=require('@ldflex/comunica');const{ namedNode}=require('@rdfjs/data-model');const{newEngine:localFileEngine}=require('@comunica/actor-init-sparql-file');// The JSON-LD context for resolving propertiesconstcontext={"@context":{"@vocab":"http://xmlns.com/foaf/0.1/","friends":"knows",}};// The query engine and its sourceconstqueryEngine=newComunicaEngine(path.join(__dirname,'ruben-verborgh.ttl'),{engine:localFileEngine()});// The object that can create new pathsconstpaths=newPathFactory({ context, queryEngine});asyncfunctionshowPerson(person){console.log(`This person is${awaitperson.name}`);console.log(`${awaitperson.givenName} is friends with:`);forawait(constnameofperson.friends.givenName)console.log(`-${name}`);}construben=paths.create({subject:namedNode('https://ruben.verborgh.org/profile/#me'),});showPerson(ruben);
Addcomunica context options which are passed to the Comunica Engine.
const{ PathFactory}=require('ldflex');const{default:ComunicaEngine}=require('@ldflex/comunica');const{ namedNode}=require('@rdfjs/data-model');// The JSON-LD context for resolving propertiesconstcontext={"@context":{"@vocab":"http://xmlns.com/foaf/0.1/","friends":"knows",}};// The query engine and its sourceconstqueryEngine=newComunicaEngine('https://ruben.verborgh.org/profile/',{options:{/* add options here */}},);// The object that can create new pathsconstpaths=newPathFactory({ context, queryEngine});asyncfunctionshowPerson(person){console.log(`This person is${awaitperson.name}`);console.log(`${awaitperson.givenName} is friends with:`);forawait(constnameofperson.friends.givenName)console.log(`-${name}`);}construben=paths.create({subject:namedNode('https://ruben.verborgh.org/profile/#me'),});showPerson(ruben);
By default the source given is also used as the destination for updates (if multiple sources are given, then the first one is chosen).
Optionally you can specify your own destination for updates as follows
// The query engine and its sourceconstqueryEngine=newComunicaEngine('https://ruben.verborgh.org/profile/',{destination:'https://example.org/destination'},);
©2018–presentRuben Verborgh, Joachim Van Herwegen,Jesse Wright.MIT License.
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Comunica query engine support for the LDflex language
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