Awesome
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.
Usage
Add this to your Cargo.toml:
[dependencies]
rdf = "0.1.4"
Basic Examples
RDF triples can be stored and represented in a graph.
use rdf::graph::Graph;
use rdf::uri::Uri;
use rdf::triple::Triple;
let mut graph = Graph::new(None);
let subject = graph.create_blank_node();
let predicate = graph.create_uri_node(&Uri::new("http://example.org/show/localName".to_string()));
let object = graph.create_blank_node();
let triple = Triple::new(&subject, &predicate, &object);
graph.add_triple(&triple);
RDF graphs can be serialized to a supported format.
use rdf::writer::n_triples_writer::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.create_blank_node();
let predicate = graph.create_uri_node(&Uri::new("http://example.org/show/localName".to_string()));
let object = graph.create_blank_node();
let triple = Triple::new(&subject, &predicate, &object);
graph.add_triple(&triple);
assert_eq!(writer.write_to_string(&graph).unwrap(),
"_:auto0 <http://example.org/show/localName> _:auto1 .\n".to_string());
RDF syntax can also be parsed and transformed into an RDF graph.
use rdf::reader::turtle_parser::TurtleParser;
use rdf::reader::rdf_parser::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::from_string(input.to_string());
match reader.decode() {
Ok(graph) => {
assert_eq!(graph.count(), 3);
assert_eq!(graph.namespaces().len(), 2);
assert_eq!(graph.base_uri(), &Some(Uri::new("http://example.org/".to_string())))
},
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:
- Turtle
- N-Triples
Future Work and Ideas
- Support querying with SPARQL
- Add support for more formats
- More comprehensive
Uri
data structure