@innotrade/enapso-sparql-tools/examples/demoGetClassSchema.js

ENAPSO Platform Independent SPARQL Tools

// Innotrade Enapso SPARQL Toolbox - example to read a class schema
// (C) Copyright 2019 Innotrade GmbH, Herzogenrath, NRW, Germany
// Authors: Alexander Schulze, Osvaldo Aguilar Lauzurique
require('@innotrade/enapso-config');
const EnapsoGraphDBClient = requireEx('@innotrade/enapso-graphdb-client');
const config = require('./examples.config');

const { getClassSchemaMeta, buildSelectQuery } = require('../index');
const CLASS_IRI = 'http://ont.enapso.com/test#Person';
const NAMED_GRAPH = 'http://ont.enapso.com/test';

// the prefixes for all SPARQL queries
const PREFIXES = [
    EnapsoGraphDBClient.PREFIX_OWL,
    EnapsoGraphDBClient.PREFIX_RDF,
    EnapsoGraphDBClient.PREFIX_RDFS,
    EnapsoGraphDBClient.PREFIX_XSD,
    {
        prefix: 'et',
        iri: 'http://ont.enapso.com/test#'
    }
];

// instantiate the GraphDB endpoint
var graphDBEndpoint = new EnapsoGraphDBClient.Endpoint({
    baseURL: config.GRAPHDB_BASE_URL,
    repository: config.GRAPHDB_REPOSITORY,
    prefixes: PREFIXES
});

async function init() {
    try {
        // build the "class schema reader" header and triples
        const classSchemaMeta = getClassSchemaMeta(CLASS_IRI, NAMED_GRAPH);

        // build the class schema reader query
        let classSchemaQuery = buildSelectQuery(
            classSchemaMeta.headers,
            classSchemaMeta.triples
        );

        // log the query to the console
        console.log('\nQuery:\n' + classSchemaQuery);

        // perform the class reader query
        let queryResult = await graphDBEndpoint.query(classSchemaQuery);

        // transform the class reader query results to a convenient result set
        let result = graphDBEndpoint.transformBindingsToResultSet(queryResult, {
            // dropPrefixes: true
            // replacePrefixes: true
        });

        // log the result to the console
        console.log('\nClass:\n' + JSON.stringify(result, null, 2));
    } catch (error) {
        console.error('\nClass:\n' + JSON.stringify(error, null, 2));
    }
}

init();