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13 changes: 12 additions & 1 deletion README.md
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Expand Up @@ -96,7 +96,18 @@ Implementations may even support users creating their own functions.

See more examples and the formal definition of the grammar in [spec/syntax.md](./spec/syntax.md).

### Implementations
## Normative Changes during Tech Preview

The Working Group continues to address feedback
and develop portions of the specification not completed for the LDML45 Tech Preview release.
The `main` branch of this repository contains changes implemented since the technical preview.

Implementers should be aware of the following normative changes during the tech preview period:
- _(list to be updated during tech preview)_

## Implementations

(The working group expects that ICU75 will include both Java and C/C++ implementations of the tech preview specification)

- Java: [`com.ibm.icu.message2`](https://unicode-org.github.io/icu-docs/apidoc/dev/icu4j/index.html?com/ibm/icu/message2/package-summary.html), part of ICU 72 released in October 2022, is a _tech preview_ implementation of the MessageFormat 2 syntax, together with a formatting API. See the [ICU User Guide](https://unicode-org.github.io/icu/userguide/format_parse/messages/mf2.html) for examples and a quickstart guide.
- JavaScript: [`messageformat`](https://github.com/messageformat/messageformat/tree/master/packages/mf2-messageformat) 4.0 implements the MessageFormat 2 syntax, together with a polyfill of the runtime API proposed for ECMA-402.
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