Summary of Requirements for <identifier>
The DLF/Aquifer Implementation Guidelines for Shareable Metadata Records recommend the use of at least one <identifier> element with the type attribute containing appropriate values in each MODS record. This element is repeatable. (page 71)
Per the Levels of Adoption Document Level 4: @authority attributes in general
Click on the Add One Identifier Block button to add another set of identifier input tags.
Required Fields have yellow-highlighted input box.
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