[−][src]Crate grdf
The Resource Description Framework (RDF) is a powerful method for modeling data and knowledge defined by the World Wide Web Consorsium (W3C). A RDF dataset consists in a collection of graphs connecting nodes, values and predicates. This crate provides traits and implementations of Generalized RDF (gRDF) where nodes, values and predicates have the same representation.
Note that this crates requires the nightly compiler. It needs Generic Associated Typed (GAT) to work properly, which are still being implemented.
Basic usage
Exploring a dataset
Each Dataset
implementation provides many iterators to explore the data.
One simple way is to iterate through the quad of the dataset:
for Quad(graph, subject, predicate, object) in dataset.quads() { // do something }
Another way is to access each graph individually using Dataset::graph
.
For a given graph, it is then possible to iterate through the triples of the
graph:
let graph = dataset.graph(id).unwrap(); for Triple(subject, predicate, object) in graph.triples() { // do something }
It is also possible to explore the graph logically, subject by subject, predicate by predicate, object by object:
// for each subject of the graph... for (subject, predicates) in graph.subjects() { // for each predicate it is subject... for (predicate, objects) in predicates { // for each triple (subject, predicate, object)... for object in objects { // do something } } }
Inserting new data
Insertion can be done on MutableDataset
implementations using
MutableDataset::insert
:
let mut dataset: HashDataset<Term> = HashDataset::new(); dataset.insert(Quad(graph, subject, predicate, object));
Again it is possible to access each graph of the dataset mutably:
let mut graph = dataset.graph_mut(id).unwrap(); graph.insert(Triple(subject, predicate, object));
Custom node type
The type used to represent RDF nodes (subjects, predicate and objects) is a
parameter of the dataset. Anything can be used although this crate provide a
default Term
type that represents generic RDF nodes (blank nodes,
IRI-named nodes and literal values).
Re-exports
pub use hash_dataset::HashDataset; |
pub use hash_dataset::HashGraph; |
Modules
hash_dataset | Dataset implementation based on |
Structs
Quad | gRDF quad. |
Triple | gRDF triple. |
Enums
Literal | RDF literals. |
Tag | Tag of a RDF tagged string. |
Term | Standard gRDF term. |
Traits
Dataset | gRDF dataset. |
Graph | gRDF graph. |
MutableDataset | Mutable dataset. |
MutableGraph | Mutable gRDF graph. |
SizedDataset | Sized gRDF dataset that can be converted into iterators. |
SizedGraph | Sized gRDF graph that can be converted into iterators. |