Oxigraph is a graph database library implementing the SPARQL standard.
Its goal is to provide a compliant, safe and fast on-disk graph database. It also provides a set of utility functions for reading, writing, and processing RDF files.
Oxigraph is in heavy development and SPARQL query evaluation has not been optimized yet.
Oxigraph also provides a standalone HTTP server and a Python library based on this library.
Oxigraph implements the following specifications: * SPARQL 1.1 Query, SPARQL 1.1 Update, and SPARQL 1.1 Federated Query. * Turtle, TriG, N-Triples, N-Quads, and RDF XML RDF serialization formats for both data ingestion and retrieval using the Rio library. * SPARQL Query Results XML Format, SPARQL 1.1 Query Results JSON Format and SPARQL 1.1 Query Results CSV and TSV Formats.
A preliminary benchmark is provided. Oxigraph internal design is described on the wiki.
The main entry point of Oxigraph is the Store struct:
```rust
use oxigraph::store::Store;
use oxigraph::model::*;
use oxigraph::sparql::QueryResults;
let store = Store::new().unwrap();
// insertion let ex = NamedNode::new("http://example.com").unwrap(); let quad = Quad::new(ex.clone(), ex.clone(), ex.clone(), GraphName::DefaultGraph); store.insert(&quad).unwrap();
// quad filter
let results = store.quadsforpattern(Some(ex.asref().into()), None, None, None).collect::
// SPARQL query if let QueryResults::Solutions(mut solutions) = store.query("SELECT ?s WHERE { ?s ?p ?o }").unwrap() { assert_eq!(solutions.next().unwrap().unwrap().get("s"), Some(&ex.into())); } ```
Some parts of this library are available as standalone crates:
* oxrdf provides datastructures encoding RDF basic concepts (the oxigraph::model module).
* spargebra provides a SPARQL parser.
* sparesults provides parsers and serializers for SPARQL result formats.
This project is licensed under either of
<http://www.apache.org/licenses/LICENSE-2.0>)<http://opensource.org/licenses/MIT>)at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Oxigraph by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.