Revisions:
To understand ecloud in a nutshell:
Record contains representations ------------->representation has versions-------------> versions contains files and has revisions ----------------------> revision > revision is marked by tags.
Versions may have revisions. One or more revisions of a version can exist and they may be used to governs necessary workflows and filter their queries. Each revision is uniquely identified by three parts: revision_name , revision_provider and revision_timestamp.
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