Git Support in Oracle SQL Developer Data Modeler 19.2 HowTo
Under the following link there was a PDF document explaining how to use the Data Modeler with Git.
https://community.oracle.com/hub/community/groundbreakers/database/developer-tools/sql_developer_data_modeler/blog/2019/08/08/git-support-in-oracle-sql-developer-data-modeler-192
Unfortunately the link is dead now.
Is the document still available somewhere else?