Feature table

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"
PID corresponding to every Cornell NetID
useful error when check digit is wrong.
vitality checking
Need to avoid unbounded generation of surrogate persistent
identifiers

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.

Child pages

Feature table