rdf-rs

Note: This project is work in progress and currently not stable.

rdf is a library for the Resource Description Framework (RDF) and SPARQL implemented in Rust.

This project is a way for me to learn Rust and combine it with my interests in semantic web technologies.

Basic Examples

RDF triples can be stored and represented in a graph.

```rust use rdf::graph::Graph; use rdf::uri::Uri; use rdf::triple::Triple;

let mut graph = Graph::new(None); let subject = graph.createblanknode(); let predicate = graph.createurinode(&Uri::new("http://example.org/show/localName".tostring())); let object = graph.createblank_node(); let triple = Triple::new(&subject, &predicate, &object);

graph.add_triple(&triple); ```

RDF graphs can be serialized to a supported format.

```rust use rdf::writer::ntripleswriter::NTriplesWriter; use rdf::writer::rdf_writer::RdfWriter; use rdf::graph::Graph; use rdf::uri::Uri; use rdf::triple::Triple;

let writer = NTriplesWriter::new();

let mut graph = Graph::new(None); let subject = graph.createblanknode(); let predicate = graph.createurinode(&Uri::new("http://example.org/show/localName".tostring())); let object = graph.createblank_node(); let triple = Triple::new(&subject, &predicate, &object);

graph.addtriple(&triple); asserteq!(writer.writetostring(&graph).unwrap(), ":auto0 http://example.org/show/localName _:auto1 .\n".tostring()); ```

RDF syntax can also be parsed and transformed into an RDF graph.

```rust use rdf::reader::turtleparser::TurtleParser; use rdf::reader::rdfparser::RdfParser; use rdf::uri::Uri;

let input = "@base http://example.org/ . @prefix rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# . @prefix foaf: http://xmlns.com/foaf/0.1/ .

http://www.w3.org/2001/sw/RDFCore/ntriples/ rdf:type foaf:Document ; http://purl.org/dc/terms/title \"N-Triples\"@en-US ; foaf:maker _:art .";

let mut reader = TurtleParser::fromstring(input.tostring()); match reader.decode() { Ok(graph) => { asserteq!(graph.count(), 3); asserteq!(graph.namespaces().len(), 2); asserteq!(graph.baseuri(), &Some(Uri::new("http://example.org/".tostring()))) }, Err() => assert!(false) } ```

Current State

Currently rdf-rs provides basic data structures for representing RDF graphs, triples and nodes. The following formats can be parsed and serialized:

Future Work and Ideas