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The OPC Foundation facilitates the adoption of OPC Technology through collaboration with other international standards organizations in order to provide Data inter-operability.
For an Overview of OPC UA Information Model activities and completed developments, you can read further at the following link: https://docs.google.com/spreadsheets/d/10SOpad6uu7JA5ZSpccVyqaqkyhYBiIXqNus28-1cJtU/edit?usp=sharing
For a list a list of list of joined Working Groups, Companion Specifications and Liaisons, you can read further at the OPC UA webpage section on Markets and Collaboration with a link:https://docsopcfoundation.google.com/spreadsheets/d/10SOpad6uu7JA5ZSpccVyqaqkyhYBiIXqNus28-1cJtU/edit?usp=sharingorg/markets-collaboration/
For further information on the OPC UA, please see attached below the OPC UA Open IEC 62 541 (current) Standard specification from Jan 2021.
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