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out-of-box implementations able to extract the ISSN from the metadata value or authority are provided.

Configuring the "Identifiers" step

By default, the "Identifiers" step is disabled.  To enable it,  update your item-submission.xml to include this tag in your <submission-process>:

<submission-process name="traditional">

   ...

   <!-- This step shows identifiers already registered for this in-progress item →

   <step id="identifiers"/>

   ...

</submission-process>

It is recommended to display this step above most others so that the submitter can clearly see any identifiers that will be created while completing their submission.

You must also enable registration of identifiers for workspace and workflow items in dspace/config/modules/identifiers.cfg or local.cfg (this is disabled by default):

identifiers.submission.register = true

While editing this configuration, pay attention to the filter configuration - logical item filters can be referenced here to apply some conditions as to whether an item qualifies for a DOI or not (eg. based on metadata entered, the type of work, or so on).

Any identifiers registered for the current submission or workflow item will be displayed in a read-only section. If no identifiers are registered, a placeholder “no identifiers” message will be displayed.

If DOI registration is configured for logical item filtering, the DOI will be minted (in a 'pending' state) or deleted as appropriate whenever the in-progress item is saved, depending on whether it passes the filter test.

See dspace/config/modules/identifiers.cfg 

Creating new Submission Steps Programmatically.

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