Source of OpenMessaging

- https://openmessaging.cloud/
-- https://github.com/openmessaging/
--- https://github.com/openmessaging/specification/blob/master/specification-schema.md

- https://www.linuxfoundation.org/Projects/open-messaging/ (ページほぼ空っぽ)

- Yahoo! JapanとEMQ XがOpenMessagingプロジェクトに加盟
--  https://www.linuxfoundation.jp/blog/2019/01/yahoo-japan-and-emq-x-join-the-openmessaging-project/