SPARQL Endpoint

Extractor, allows the user to extract RDF triples from a SPARQL endpoint using a CONSTRUCT query.

Endpoint: URL of the SPARQL endpoint to be queried
MIME type: MIME type to be used in the Accept header of the HTTP request made by RDF4J to the remote endpoint
SPARQL CONSTRUCT query: Query for extraction of triples from the endpoint

Characteristics

ID: e-sparql
Type: extractor
Inputs: RDF single graph - configuration
Outputs: RDF single graph
Look in pipeline
Sample pipeline: First; Second

The SPARQL Endpoint component queries a remote SPARQL endpoint using a SPARQL CONSTRUCT query. It can be configured at runtime using RDF configuration, which can be generated by another component. The MIME type setting can be useful to overcome certain serialization bugs present in some SPARQL endpoint implementations.

Runtime configuration

Below you can see sample runtime configuration for the component, which includes specification of default graph IRIs. You can also import a sample pipeline. Note that RDF blank nodes are not allowed in runtime configurations.

@prefix se: <http://plugins.linkedpipes.com/ontology/e-sparqlEndpoint#> .

<http://localhost/config> a se:Configuration ;
    se:query "CONSTRUCT { ?s ?p ?o } WHERE { ?s ?p ?o}" ;
    se:endpoint <http://linked.opendata.cz/sparql> ;
    se:defaultGraph <http://comsode.eu/resource/dataset/COMSODE_D3.2> ;
    se:defaultGraph <http://linked.opendata.cz/resource/dataset/coi.cz/kontroly> .