-WASI P1 APIs were defined with WITX Interface Description Language (IDL), which was an iterative step toward WIT but bears notable differences, including that it was developed as a lower-level derivation of WebAssembly Text Format (a human-readable source format for Wasm modules). Documentation for WASI 0.1 and WITX can be found in the [`legacy` directory of the WASI GitHub repository](https://github.com/WebAssembly/WASI/blob/main/legacy/README.md), along with a [complete list of 0.1 types and modules](https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md).
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