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Publication workflows
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Summary
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Datasets should have a publication workflow, so they can be fetched
into database and reviewed before beeing publicly released.

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Rationale
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Use cases:

 - publication workflow 

   e.g.: A dataset is automatically published for public use one year
   after acquisition date.

 - validation workflow

   e.g.: A dataset is published after some external validation process
   (human validation, etc...).

May depend on :doc:`DOI support <doi_support>`.

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Design
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Should support manual and programmable (recurrent) transitions.

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Implementation
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