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

 

HDL

PURLz

permanent

Yes

?

permanently resolve to a digital object

Yes

?

unique within our PID system without the DNS name portion of the

Yes; very flexible naming, including pseudo/paths

?

URL

?

?

works with VIVO, arXiv, OAIS (CUL), Voyager Catalog, and WorldCat etc.

Yes

?

resolvable through a web browser

Yes

?

Simplicity

Yes

?

support for a local namespace prefix and an identifier part

Yes

?

support for opaque identifiers

Yes

?

Local part should not be Cornell branded

completely flexible

?

may be surrogate for physical object

Yes

?

should be short (so use 26 letters plus numbers)

Yes

?

should be easy to copy by hand

depends on the length

?

For Resolver and System

 

HDL

PURLz

Supports billions of identifiers

Don't know; limited to the practical capacity of the underlying database.

?

Robust architecture

Yes

?

Robust implementation

Yes

?

ability to request metadata about the identifier

Yes

?

lightweight understanding of identifier equivalence

Yes

?

should be easily discoverable by Google

Yes;  the resolvers can't be crawled without providing a dump

?

integrate well with the "web architecture"

Yes

?

vitality checking

? 

?

Need to avoid unbounded generation of surrogate persistent identifiers

?

?

PID corresponding to every Cornell NetID

?

?

Governance Issues

 

HDL

PURLz

Requires payment to external organization

one-time $50 payment per named resolver (not mirrors)

?

Can continue resolve IDs in absence of external organization

Yes

?

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.

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