A public metadata is a metadata that has the view privilege for the group named all.
An administrator can view any metadata.
A reviewer can view a metadata if:
The group owner is one of the groups assigned to the reviewer.
He is the metadata owner.
A user administrator or an editor can view:
All metadata that have the view privilege in one of the groups visible to them.
All metadata created by theirself.
A registered user can view:
All metadata that have the view privilege in one of the groups visible to them.
Public metadata can be viewed by any user (logged in or not).
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