olid-data-workers/laravel-sparql

[1ats]

@njh
Laravel Framework 8.83.27

EasyRdf\Parser\Exception
Failed to parse statement on line 2
http://localhost:8000/

EasyRdf\Parser\Ntriples::parse
vendor/easyrdf/easyrdf/lib/Parser/Ntriples.php:209

public function parse($graph, $data, $format, $baseUri)
{
parent::checkParseParams($graph, $data, $format, $baseUri);

    if ($format != 'ntriples') {
        throw new \EasyRdf\Exception(
            "EasyRdf\\Parser\\Ntriples does not support: $format"
        );
    }

    $lines = preg_split('/\x0D?\x0A/', strval($data));
    foreach ($lines as $index => $line) {
        $lineNum = $index + 1;
        if (preg_match('/^\s*#/', $line)) {
            # Comment
            continue;
        } elseif (preg_match('/^\s*(.+?)\s+<([^<>]+?)>\s+(.+?)\s*\.\s*$/', $line, $matches)) {
            $this->addTriple(
                $this->parseNtriplesSubject($matches[1], $lineNum),
                $this->unescapeString($matches[2]),
                $this->parseNtriplesObject($matches[3], $lineNum)
            );
        } elseif (preg_match('/^\s*$/', $line)) {
            # Blank line
            continue;
        } else {
            throw new Exception(
          "Failed to parse statement",     **line 209**
                $lineNum
            );
        }
    }

    return $this->tripleCount;
}

[madbob]

Incidentally I'm the author of laravel-sparql (even if someone else has published it on Packagist...), and that project is abandoned.

If you are interested in a SPARQL ORM (not strictly integrated with Laravel, but yet inspired by Laravel's ORM), I suggest you to give a try to SPARQLer (and provide feedback on the proper repository),

[1ats]

Dear madbob,

1- Thank you very much for your feedback. I read it on SPARQLer and found it very interesting, but:

2- Right now my biggest problem is finding a tool that allows me to create a Sparql endpoint.

2.1 - I tried using Ontop CLI (https://ontop-vkg.org/tutorial/endpoint/endpoint-cli.html), tomcat-ontop-bundle.zip (https://github.com/ontop/ontop-examples /blob/master/ekaw-tutorial-2016/session1/sparql-endpoint.md) but I had no success in the settings.

2.3 I need to have a Sparql endpoint and then use it here:

/ Wikidata client
$client = new Client([
'host' => 'https://query.wikidata.org/sparql',

2.3 I created my ontology in protégé. Is there a tool or API that allows me to create a Sparql endpoint easily? In this tool (SPARQLer) can I make a sparql query loading my ontology from the computer (without a Sparql endpoint)?

4 - I will be very grateful for your help.

[madbob]

Well, no: SPARQLer (like EasyRDF, or laravel-sparql) are intended to query an existing endpoint, not publish a new one.

You need a totally different tool: Virtuoso, Jena, QLever... In my experience, the Docker Jena image is (almost) easy to setup.

I don't know if there is some easier tool to publish a mock of a SPARQL endpoint.

[k00ni]

You could also try (PHP-based) ARC2: https://github.com/semsol/arc2/wiki/SPARQL-Endpoint-Setup. Be aware though, this project is barely maintained.

[1ats]

Dear @madbob and @k00ni, thank you for your return I will take a look at these tools, anything I will come back here.

[1ats]

Dear @k00ni,

I did the following setup (https://github.com/semsol/arc2/wiki/SPARQL-Endpoint-Setup). The database connection is working correctly. Takes me to a screen (ARC SPARQL+ Endpoint (v2011-12-01)). But I have some doubts:

1- How do I create a sparql endpoint on this screen?
2- Maybe not necessary, but in which part of this configuration (https://github.com/semsol/arc2/wiki/SPARQL-Endpoint-Setup) do I add my ttl, OWL/XML, rdf file?

Grateful.

[k00ni]

@1ats please add an issue at https://github.com/semsol/arc2 and discuss it there.