improve mets generation

Description

-Generators use UUID's which are hard for humans to read and figure out
-no method to update mets.xml when files are added or removed (multiple without EventHandler)
-make API more reusable

Environment

None

Assignee

Matthias Eichner

Reporter

Matthias Eichner

Labels

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URL

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External issue ID

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Components

Fix versions

Priority

Medium
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