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| Supports billions of identifiers | Robust architecture | Robust implementation | ability to request metadata about the identifier | lightweight understanding of identifier equivalence | should be easily discoverable by Google | integrate well with the "web architecture" | PID corresponding to every Cornell NetID | useful error when check digit is wrong. | vitality checking | Need to avoid unbounded generation of surrogate persistent identifiers |
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HDL |
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PURL |
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PURLz |
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