SPARQL dataset transformer:

This code will transform SPARQL queries based on different aproaches like(RDF reification, N-ary relations, Singleton property, Ndfluents) to Named Graphs.

Example:

This SPARQL query is based one RDF reification:

PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT * WHERE{
    ?st rdf:type rdf:statement.
    ?st rdf:subject ?s.
    ?st rdf:predicate ?p.
    ?st rdf:object ?o.
}

That SPARQL query will be transformed to a new query based on Named graph approach :

SELECT * WHERE{GRAPH ?st {?s ?p ?o .}}

Requirements:

1. JDK 1.8
2. Maven

First run this command on the project path to build the jar file:

$ mvn clean package

To execute the generated jar file:

$ java -jar target\SparqlTransform-1.0-SNAPSHOT-jar-with-dependencies.jar -t "query_type" -d "dataset_path" -q "SPARQL_query" -m "query_mapping" 

• -q : will take SPARQL query as an argument.
• -t : will take the SPARQL query type(reification,singleton,ndfluents,nary).
• -d : will take the path of the dataset that we want to use.
• -m : will take the metadata of the query we use it in ndfluents and n-ary relations.
• -qf : will take the path of a SPARQL query file.
• -o : will take a path to an output file to write the new query.
• -mf : will take the path of a metadata file.

You can check the web version here.