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Document and define WIT IDs that are referenced elsewhere #298

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13 changes: 13 additions & 0 deletions design/mvp/WIT.md
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Expand Up @@ -65,6 +65,19 @@ in the Component Model's representation of [`interface`s][interfaces] and

[names of imports and exports]: Explainer.md#import-and-export-definitions

## WIT IDs

Leaf elements in WIT files have IDs that are references to their canonical
definitions. A WIT ID includes the WIT package specifier and path within that
uniquely defines the element.

For example, the `wasi:[email protected]` world imports the `wall-clock` interface
which has a `now: func() -> datetime` method. The ID for this method would be
`wasi:[email protected]/wall-clock/now`.
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FWIW, the version string is specified to go at the end, so it'd be wasi:clock/[email protected].


When different worlds are combined, the canonical IDs of leaf
nodes will be used for deduplication.

## WIT Interfaces
[interfaces]: #wit-interfaces

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