For Identifiers (just the complete URI and local part, not about mechanisms)
|
HDL |
PURLz |
---|---|---|
Yes |
Yes |
|
Yes |
Yes |
|
unique within our PID system without the DNS name portion of the |
Yes; very flexible naming, including pseudo/paths |
|
? |
Yes |
|
works with VIVO, arXiv, OAIS (CUL), Voyager Catalog, and WorldCat etc. |
Yes |
does nothing in and of itself to not work with existing systems; |
Yes |
Yes |
|
Yes |
Yes |
|
Yes |
Yes |
|
Yes |
Yes |
|
completely flexible |
Yes |
|
Yes |
Yes |
|
Yes |
Yes |
|
depends on the length |
depends on the length and/or layout |
For Resolver and System
|
HDL |
PURLz |
---|---|---|
Don't know; limited to the practical capacity of the underlying database. |
Don't know – mention of 1996 tests resolving 50 resolutions/sec with a database of 500,000 PURLS in Long Introduction to PURLs |
|
Yes |
Yes; PURLz is just a simple HTTP server using MySQL |
|
Yes |
No - alpha stage |
|
Yes |
Yes |
|
Yes |
Cloning an existing PURL and chaining a PURL |
|
Yes; the resolvers can't be crawled without providing a dump |
Yes; the resolvers can't be crawled without providing a dump |
|
Yes |
Yes |
|
? |
not built in |
|
Need to avoid unbounded generation of surrogate persistent identifiers |
? |
? |
? |
Depends on the Partial Redirect working – e.g., http://resolver.cornell.edu/netid/bdc34 |
Governance Issues
|
HDL |
PURLz |
---|---|---|
one-time $50 payment per named resolver (not mirrors) |
no |
|
Can continue resolve IDs in absence of external organization |
Yes |
Yes |
HDL is Corporation of National Research Initiatives's Handle system.
PURLz is Zepheira's and OCLC's new persistent URL work.
Footnotes
- Uniqueness: We think PURLZ will reject the creation of a duplicate PURL, but we're not entirely sure how it deals with duplication when a PURL name component overlaps a PURL domain component – e.g., if we inadvertently created a domain /a/b/ with resource 1234 and someone later used the name b/1234 in domain /a/. Maybe pure string comparison for non-uniqueness is all that's required, but conventions need to be established to avoid confusion.