README.md

JSON to RDF

WORK-IN-PROGRESS

This library transforms JSON data to RDF using a RML mapping file.

1. Loads in memory the rml model
2. Generates the subjects with defined URI templates
3. Add RDF.types to the subjects
4. Generate properties

Use

This application implements the RML specification. To learn how to create RML flies please go to the Specs section.

A fat jar is packaged to be used as a java executable:

    $ java -jar json2rdf-0.1.0-jar-with-dependencies.jar
    Usage: <main class> [options]
      Options:
        --help, -h
    
      * --inputFile, -f
          JSON file to convert
      * --rml, -m
          RML mapping file

TODO

• Add RML.joinCondition support
• RDF.List as Data Type
• Script Engine
• Add generated sources to target directory
• Add the project to maven central

Future work

Using scripting templates

Use iteration index to create consecutive URI

rml:logicalSource [
    rml:source "source.json";
    rml:referenceFormulation ql:JSONPath;
    rml:iterator "$.store.books.[*]"
  ];
rr:subjectMap [
    rr:template "http://example.com/book/{{}}" ;
    rr:class kso:DnsRequest
];

Javascript

rr:subjectMap [
    rr:template "http://example.com/book/{{uuid.generate()}}" ;
    rr:class owl:Thing
];

  rr:predicateObjectMap [
    rr:predicate schema:title;
    rr:objectMap [
       rml:reference "title" ;
       rr:datatype xsd:string
       rml:script: ""
    ];
  ];