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For Identifiers (just the complete URI and local part, not about mechanisms)

	HDL	PURL	PURLz	HNRS	DOI
permanent	?	?	?	?	?
permanently resolve to a digital object	?	?	?	?	?
unique within our PID system without the DNS name portion of the	?	?	?	?	?
URL	?	?	?	?	?
works with VIVO, arXiv, OAIS (CUL), Voyager Catalog, and WorldCat etc.	?	?	?	?	?
resolvable through a web browser	?	?	?	?	?
Simplicity	?	?	?	?	?
support for a local namespace prefix and an identifier part	?	?	?	?	?
support for opaque identifiers	?	?	?	?	?
Local part should not be Cornell branded	?	?	?	?	?
may be surrogate for physical object	?	?	?	?	?
should be short (so use 26 letters plus numbers)	?	?	?	?	?
should be easy to copy by hand	?	?	?	?	?

For Resolver and System

	HDL	PURL	PURLz	HNRS	DOI
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"	?	?	?	?	?
vitality checking	?	?	?	?	?
Need to avoid unbounded generation of surrogate persistent identifiers	?	?	?	?	?
PID corresponding to every Cornell NetID	?	?	?	?	?
useful error when check digit is wrong	?	?	?	?	?

Governance Issues

	HDL	PURL	PURLz	HNRS	DOI
Requires payment to external organization	?	?	?	?	?
Can continue resolve IDs in absence of external organization	?	?	?	?	?

HDL is Corporation of National Research Initiatives's Handle system.
PURL is OCLC's PURL system.
PURLz is Zepheira's and OCLC's new persistent URL work.
HNRS is the Harvard Name Resolution Service.
DOI is IDF's DOI system.