EZID: Easy Persistent Identifiers and Data Citation
31 October 2011
John Kunze and Joan StarrCalifornia Digital Library
EZID: Easy Persistent Identifiers & Data Citation
IntroductionCitation, DataCite and EZID
Who? Why? What?
EZID’s next steps: tech talkNew stuff, use cases, feedback
Feedback
California Digital Library (CDL)
The research data problem
an article about data, but no data
What citation offers
• To aid scientific reproducibility• To provide fair credit• To ensure scientific transparency and reasonable accountability
• To aid in tracking the impact, including– helping data authors verify use of their data and– helping future data users identify how others have used the data
German National Library of Economics (ZBW)
German National Library of Science and Technology (TIB)
German National Library of Medicine (ZB MED)
GESIS - Leibniz Institute for the Social Sciences, Germany
Australian National Data Service (ANDS)
ETH Zurich, Switzerland
Canada Institute for Scientific and Technical Information
(CISTI)
Technical Information Center of Denmark
Institute for Scientific & Technical Information (INIST-
CNRS), France
TU Delft Library, The Netherlands
The Swedish National Data Service (SNDS)
The British Library , UK
California Digital Library (CDL), USA
Office of Scientific & Technical Information (OSTI), USA
Purdue University Library
DataCite
EZID: long-term identifiers made easy
take control of the management
and distribution of your research,
share and get credit for it, and
build your reputation through its
collection and documentation
Primary Functions1. Create persistent identifiers2. Manage identifiers over time3. Manage associated metadata over time
http://n2t.net/ezid
Current EZID Clients
UC Berkeley Library (on behalf of the UC Berkeley campus) Sponsored accounts:
The Digital Archaeological Record (tDAR)
Open Context Dryad Digital Repository
CRCNS.org
UC San Diego Library (on behalf of the UC San Diego campus)
Fred Hutchinson Cancer Research Center
American Astronomical Society (AAS) LabArchives
Centre national de documentation pédagogique (CNDP)
National Center for Atmospheric Research (NCAR)
Cornell Institute for Social & Economic Research
USGS/Earth Sciences Data Clearinghouse (formerly National Biological Info. Infrastructure)
A partial list
New features in trial or active development
• Service replicas: manager and resolver• URN (Uniform Resource Name) support (urn:uuid:)• Suffix pass-thru: do NT and get N/ST/S for free• Tombstone/incubation/... surrogate pages, id status (reserved or public), and multiple targets
• Identifier status: reserved or public• Content negotiation and inflections: ? ?? / .• ARK community and governance, eg, registries
Service replicas
• EZID is an id manager that populates N2T– It tolerates down time– Other id manager services might one day populate N2T
• N2T (Name-to-Thing) is an id resolver that ...– It is very intolerant of down time, since it services all
access requests for locations and metadata– N2T was designed with global replication in mind
URN support
• N2T and EZID are agnostic about kinds of things, names, and metadata– Digital, physical, abstract, living, fictional, groups, etc.– Any metadata & known profiles (DataCite, Dublin Kernel)– ARK, DOI, URN, Handle, IVOA, LSID, PMID, etc., requiring
namespace “write” permission, eg, via DataCite
• In test: Uniform Resource Names (URNs)– urn:uuid namespace
Under the hood keysmithing terms: bows, shoulders, blades, tips, covers
Suffix pass-thru: NT gets N/ST/S for free
Idea: if name N points to target T, then requests for N extended by any suffix N/S can take you to T/S
• For dataset doi:10.5072/Big4 with 10,000 nameable components,– Register and manage 10,001 names or 1 name?– Eg, http://x.y.z/foo/Big4/db/table/cell/45-8.txt could be reached with doi:1.5072/Big4/table/cell/45-8.txt
• In test with ARKs. Conflict with other resolvers?
Tombstone and other surrogate pages
Tombstone, incubation, and other surrogate pages (probation?) auto-generated from metadata, eg,
http://n2t.net/ezid/tombstone/id/ark:/20775/bb3243444z
Reserved identifiers and multiple targets
• Some ids must be created and managed (reserved) before going public, eg, for manuscript preparation
• In test: infrastructure for multiple targets and multiple instances of any metadata element
• What should user experience be for multiple targets? – Present a menu of targets (burden of choice)?– One target chosen for them (burden of inflexibility)?
Identifier (ARK) inflections: ? ?? / .
• Inflect: change endings w.o. creating new words– Terminal ? means “I want metadata”, which is similar to linked data content negotiation (also in EZID test)
– Terminal ?? means “I also want support metadata”– Drawing board: / could mean “I want a landing page” and . could mean “I want the usual computable thing”
• Allow inflections beyond ARKs to DOIs/URNs?
Example: http://n2t.net/ark:/13030/qt0349g1rh?
erc:who: Renninger, Heidi,; Phillips, Nathan,; Hodel, Donald,what: Comparative hydraulic and anatomic properties in palm trees (Washingtonia robusta) of varying heightswhen: 2009-04-29where: ark:/13030/qt0349g1rh
Renninger, Heidi; Phillips, Nathan; Hodel, Donald. “Comparative hydraulic and anatomic properties in palm trees (Washingtonia robusta) of varying heights”. 2009-04-29. ark:/13030/qt0349g1rh
HTML content with embedded comments in ANVL/ERC and RDF
ARK community and governance
• ARKs soon to have a mailing list• Topics: governance, community, standardization• Registry maintenance: shoulders and NAANs• N2T consortium with alternative EZID-like services
For information
• http://www.cdlib.org/services/uc3/ezid• Understanding ids and conventions (shoulders, etc)• Choosing the right identifier (ARK vs DOI? ARK and DOI?)• EZID FAQs and N2T vision• EZID Service Guidelines• EZID Handout/brochure• EZID webinars & slides
Contact Joan Starr at [email protected]
For (even) more informationEZID http://n2t.net/ezid/ http://www.cdlib.org/services/uc3/ezid/
UC Curation Center http://www.cdlib.org/uc3 [email protected]
UC3 webinar series http://www.cdlib.org/uc3/uc3webinars.html
UC3/CDLStephen Abrams David LoyLisa Colvin Mark Reyes Patricia Cruse Abhishek SalveScott Fisher Tracy Seneca Erik Hetzner Carly Strasser Greg Janée Joan StarrJohn Kunze Marisa StrongMargaret Low Perry Willett
Questions?
by Horia Varlan http://www.flickr.com/photos/horiavarlan/4273168957/in/photostream/