# Attribution

PureYAML is an independent Swift implementation.

This project is informed by the behavior and public API surface of
[Yams](https://github.com/jpsim/Yams), and by the YAML parsing model embodied in
Yams' bundled `CYaml` / libyaml-derived C sources. Yams is an important Swift YAML
package, and its behavior is a compatibility reference for PureYAML.

PureYAML does not copy Yams Swift source code, `CYaml` C source code, or libyaml
C source code into the public package. The implementation under `Sources/` is
written in Swift for this repository.

Yams and libyaml source remain available from their upstream projects:

- https://github.com/jpsim/Yams
- https://pyyaml.org/wiki/LibYAML

This file is the canonical attribution notice for the project; the `LICENSE`
file is kept to the standard MIT text so it is correctly detected as MIT.

The private `PureYAMLResearch` repository contains a full Yams source snapshot
for study and compatibility research. That repository is not the implementation
source for PureYAML.

## Vendored test data

`Tests/Fixtures/yaml-test-suite/` contains input cases vendored from the official
[YAML test suite](https://github.com/yaml/yaml-test-suite) (`data` branch, commit
`6ad3d2c62885d82fc349026c136ef560838fdf3d`), which is distributed under the MIT
license. All 402 cases (numbered sub-cases counted) are vendored, each as its input
(`in.yaml`), expected JSON projection (`in.json`), and/or expected-error marker
(`error`). `Tests/Fixtures/yaml-test-suite-manifest.yaml` records the provenance and
each case's conformance status. These files are test data, not implementation
source.