# RDFtk: Core
The core data model; concrete implementations for `Statement`s and `Literal`s, along with a concrete `Resource` type
that provides a builder-like experience for models.
[](https://crates.io/crates/rdftk_core)
[](https://docs.rs/rdftk_core)
## Example
```rust
use rdftk_core::{Literal, Statement, SubjectNode};
use rdftk_iri::IRI;
use std::rc::Rc;
use std::str::FromStr;
pub fn make_statements() -> Vec<Rc<Statement>> {
let mut statements: Vec<Rc<Statement>> = Default::default();
statements.push(Rc::new(Statement::new(
SubjectNode::named(IRI::from_str("http://en.wikipedia.org/wiki/Tony_Benn").unwrap()),
IRI::from_str("http://purl.org/dc/elements/1.1/title").unwrap(),
Literal::new("Tony Benn").into(),
)));
// ...
statements
}
```
## Changes
**Version 0.1.9**
* Support for [RDF*](https://w3c.github.io/rdf-star/) in `Statement`.
* Added additional constructors to `Statement`.
* Renamed Resource method `rdf_type` to `instance_of` for compatibility with RDF schema usage.
* Added `is_valid` associated function to `QName`.
**Version 0.1.8**
* Explicit exports over `pub use *`.
**Version 0.1.7**
* Split `Graph` into `Graph` and `MutableGraph`.
* Split `NamedGraph` into `NamedGraph` and `MutableNamedGraph`.
* Added `get_default_namespace` to the `PrefixMappings` trait as a helper function.
* Altered `PrefixMappings::compress` and `PrefixMappings::expand` to take references.
**Version 0.1.6**
* Explicit version management.
**Version 0.1.5**
* Updates for rdftk_memgraph to build.
**Version 0.1.4**
* Made all local dependencies only major/minor valued.
**Version 0.1.3**
* Moved all `IRI` to `IRIRef` on interfaces.
* Moved `Graph` and associated types into core and deprecated `rdftk_graph`.
**Version 0.1.2**
* Clean-up changes.
**Version 0.1.1**
* Added `From` to allow direct construction of a `SubjectNode` from an `IRI`.
* Fixed a bug in `QName` that dropped the ":" for non-prefixed values.
**Version 0.1.0**
* First release.
## TODO
TBD
[](http://www.w3.org/2001/sw/wiki/RDF)