Rust crates
FerroEHR’s openEHR specification layer is published on crates.io as eight standalone Rust crates, usable without the CDR. They are the same crates the server itself is built on: the spec types are generated deterministically from the official openEHR machine-readable artifacts (BMM/XSD/OpenAPI), and the engines (ADL, AQL, serialization runtimes) are hand-written against the vendored specification text.
| Crate | Implements | What it gives you |
|---|---|---|
openehr-base | BASE 1.3.0 | Foundation + base types (identification, intervals, ISO-8601 types) |
openehr-rm | RM 1.2.0 | The Reference Model: COMPOSITION, data structures/types, change control, generated invariant validation, the static RM attribute model |
openehr-am | AM 1.4 + 2.4 | The Archetype Object Model, both generations (am14/am24) |
openehr-adl | ADL 2.4 | ADL2/cADL/ODIN parser, AOM2 validation, flattener, OPT2, ADL 1.4→2 conversion |
openehr-term | TERM 3.1.0 | Terminology model + the embedded official openEHR terminology (five languages) |
openehr-lang | LANG | The BMM meta-model (both generations) + an ODIN parser |
openehr-query | QUERY 1.1 | AQL lexer, parser, and typed AST |
openehr-its | ITS-REST 1.1.0 | Canonical JSON + XML codecs, the generated ITS-REST contract, OPT 1.4, Simplified Data Formats (FLAT/STRUCTURED/Web Template) |
[dependencies]
openehr-rm = "0.0.1"
openehr-its = "0.0.1"
Versioning
The package version is the crates’ own independent SemVer line — it
tracks this implementation’s code and moves freely with fixes and
improvements, never with the vendored openEHR specification versions. While
the line is 0.0.x, expect breaking changes between releases, which always
ship in lockstep across all eight crates.
The implemented specification version is independent of the package version and always available at runtime:
#![allow(unused)]
fn main() {
assert_eq!(openehr_rm::SPEC_VERSION, "1.2.0");
}Licensing
The Rust code is MIT. Crates that embed material derived from the official
openEHR machine-readable artifacts (generated types with spec doc text, the
terminology XML, the ITS-JSON schema) are MIT AND Apache-2.0, with both
license texts shipped in the package. The openEHR specifications themselves
are © the openEHR Foundation.