A data use case domain, also SQL domain, is a dictionary object that belongs to a schema and encapsulates a set of optional properties and constraints.
This video shows how to create and alter a SQL Domain, provides several usage examples, and demonstrates how to manage it.
For more information on 23ai, please refer to the following page to get a list of useful links to postings and videos
https://github.com/oracle-devrel/technology-engineering/tree/main/data-platform/core-converged-db/database-23ai#team-publications