CODEWITHSUNDEEP
rdfapache-jena
Jeff
Jeff

Reputation: 4003

Load Duplicate RDF triples into Apache Jena Fuseki

I am wondering if there is a way to initiate Apache Jean Fueseki server to accept log duplicate triples. see https://jena.apache.org/documentation/serving_data/

Right now I'm starting Fuseki with the following command

 ./fuseki-server --update --mem /ds

Then I'm loading in xml/rdf files using the post tool that comes with Fuseki, like so:

./s-post http://localhost:3030/ds/data default ~/Desktop/scta/commentaries/pp-projectdata.rdf

The file pp-projectdata.rdf sometimes contains identical triples, but I want these duplicates to be loaded so I can count the number of instances of this triple.

Upvotes: 3

Views: 756

Answers (1)

RobV
RobV

Reputation: 28636

Duplicate triples are not a part of the RDF data model and as such any RDF processor will typically silently ignore them.

From the RDF 1.1 specification:

The core structure of the abstract syntax is a set of triples, each consisting of a subject, a predicate and an object. A set of such triples is called an RDF graph.

Set is used in the mathematical sense i.e. no duplicates.

More specifically the RDF XML 1.1 specification says the following:

Software transforming RDF/XML into a representation of a graph may eliminate duplicate predicate arcs.

i.e. duplicate triples may be ignored/discarded

So Fuseki (or any other RDF processing system) is explicitly permitted to discard duplicates

Upvotes: 5

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