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What is a persistent identifier?
What is name resolution?What is name resolution?
Why use persistent identifiers?
What resources should be named?
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If a resource moves or changes the way it is accessed, the mapping between the resource's persistent identifier and URL is updated; the persistent identifier remains unchanged and valid.
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Why use persistent identifiers?
In general, important resources should never be directly identified by a URL because URLs can become invalid if the resource is moved or if the way it is accessed changes. (This is the cause of the "404 File Not Found" browser error message.) By adding a layer of indirection into the access process, persistent identifiers will never become invalid. If a resource moves, only the URL to which the persistent identifier resolves needs to be updated; the identifier itself can remain unchanged. As long as persistent identifiers are properly maintained within NRS, 404 errors should never occur when accessing named resources.
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