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- Identifiers must be permanent
- Identifiers must permanently resolve to a digital object
- Simplicity (of description and implementation)
- Support for vitality checking
- Needs to support multiple repositories and naming schemes
- Makes sense in context of VIVO, arXiv, OAIS (CUL), Voyager Catalog, and WorldCat
- Local part should not be Cornell branded so that it is compatible with multi-institution collections where Cornell branding is inappropriate. Generally, these identifiers should be branded to Cornell through the use of a Cornell-based DNS name for the full URI/resolver. It should also be possible to use the local part with non-Cornell resolver for consortia and other non-Cornell-branded needs (cf. DOI, handle; not our purl)
- Identifiers should be short (so use 26 letters plus numbers)
- Identifiers should be easy to copy by hand - separate every 4 characters with a dash
- It must be possible to support opaque identifiers
- Must be resolvable through a web browser
- Must be unique without the DNS name portion of the URL (only possible when space defined)
- Should include a check digit
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