[Archivesspace_Users_Group] external_id's

[Steven Majewski]

I see there is a GET /by-external-id in the API. 

None of my imported resources appear to have any values for external_id. 
I don’t see a mapping to or from external_id in the export/import maps.
And I don’t see anywhere in the EDIT resource page to add an external_id. 
And the MySQL table external_id is empty in my DB. 

What are external_id’s for and how do they get assigned ? 

— Steve Majewski

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