EZID (easy-eye-dee) makes it easy for University of California (UC) scholars and researchers to create and manage long-term, globally unique identifiers for data and sources, ensuring their future discoverability. Use EZID to:
What our users are saying:
"EZID gives Open Context critical services that help make our data publications lasting contributions to the scholarly record. Because of EZID, we can explore innovative new approaches in publishing that can be used and cited in years to come."
"The partnership between EZID and Crossref presents an exciting opportunity for eScholarship and our journal partners. The inclusion of our Open Access publications in new discovery services via Crossref, particularly its metadata feed, will dramatically increase the exposure of the important scholarship published on our platform."
|Assoc/Bac Granting Institution*||$300|
|Masters Granting Institution*||$600|
|Research Institution or Non-Profit Organization*||$1,500|
|Research group, department, or team||$500|
|Small (less than 100 employees)||$1,500|
|Medium (100 to 500 employees)||contact us|
|Large (over 500 employees)||contact us|
* Consortium (3 or more institutions or organizations) 20% discount on any fee marked
For any questions regarding the above categories or rates, please contact us.
University of California researchers: please contact us for UC rates.
An identifier is an association between a character string and an object. Objects can be files, parts of files, names of persons or organizations, abstractions, etc. Objects can be online or offline. Character strings include URLs, serial numbers, names, addresses, etc. A "persistent identifier" is an identifier that is available and managed over time; it will not change if the item is moved or renamed. This means that an item can be reliably referenced for future access by humans and software. EZID currently supports persistence for two kinds of identifiers: DataCite Digital Object Identifiers (DOIs) and lower-cost Archival Resource Keys (ARKs).
DOI stands for "Digital Object Identifier." It is an identifier originating from the publishing world and in widespread use for journal articles. DOIs become persistent when the objects and identifier forwarding information are maintained.
ARK stands for "Archival Resource Key." It is an identifier originating from the library, archive and museum community. ARKs become persistent when the objects and identifier forwarding information are maintained.
ARK identifiers have certain features that can be very useful for:
This can make it attractive to use ARKs during the early part of a dataset's "life" or the early stages of the research process. Then, when the time comes to begin writing up results and it becomes clear which object(s) will be cited, it may appropriate to get DOIs for those objects.
DOIs have the citation-level "reputation" and it is possible to use the ARK of the cited object as the "suffix" for the DOI so that there is a traceable connection between the two. Here is what that means:
Step 1. You assign an ARK to a resource for good management and tracking: ark:/99999/fk4sf2w65j
Step 2. You decide to cite the resource, so you want a DOI.
Step 3. Using either the Advanced Create UI or the API, request a doi with this form: doi:10.5072/FK2fk4sf2w65j
In this way, the two identifiers have a relationship, so the object can be tracked throughout its life cycle. With EZID, clients get access to both of these identifiers and can take best advantage of both approaches.
Instead of leading directly to an object, one identifier frequently points to another, or "target URL", that leads directly to the object. The process of getting to the final target name, possibly via a chain of intermediate names, is called "resolution." Resolution on the web is usually fast and invisible. It is done behind the scenes on your behalf by web browsers. Unsuccessful resolution, however, usually means visible failure to access the object that you were expecting, resulting in a "broken identifier." Objects tend to move, so identifier persistence depends on resolution using up-to-date target URLs. To make this happen, EZID provides a way for people to update target URLs as they change when objects move around. This is very similar to leaving a forwarding address when you change your residence. As the starting point for resolution, the resolver effectively lets you publicize an unchanging identifier that you maintain so that it will consistently hit a target that may be moving. EZID currently updates two resolvers: N2T (Name-to-Thing) based at n2t.net and the DOI (Digital Object Identifier) resolver based at doi.dx.org.
Metadata is information (data) about the object, such as the name of the object's creator, the date of creation, the target URL, the version of the object, its title, and so on. EZID allows the user to enter metadata at the same time as an identifier is requested. Associating metadata with identifiers enables more sophisticated mechanisms for digital content discovery and higher-level assurances of long-term persistence.
Please contact us with any questions or comments. Also, see Identifier Basics for more information about the identifier practices implemented by the EZID team.
For information about the status of the EZID system, please consider the following options:
By working with CDL and EZID, you are automatically working with DataCite, because CDL is a full DataCite member. This diagram may help explain the relationships.
Once the main account is set up, if you would like to sponsor other groups, then you would use the sponsored account order form to request new accounts. Please contact us for this form if you don't have it. In addition, we provide customizable outreach materials and presentations you can re-purpose to use at your institution.
We take care of this for you, based on the information you provide on the forms mentioned above.
If you submit content to a repository or service working with EZID, the ARKs or DOIs it assigns come from EZID.
EZID identifiers can be related to external links if you associate them with metadata, for example by using the relatedIdentifier field in the DataCite metadata schema.
If you would like to include clickable links to DOIs and ARKs on a landing page, we recommend that you format them following this html template:
DOI: <a href="http://dx.doi.org/10.1234/ABCD">doi:10.1234/ABCD</a>
ARK: <a href="http://n2t.net/ark:/12345/abcde">ark:/12345/abcde</a>
Because EZID has an API, it is possible to write code to interact with your Dspace repository.
If an account-holder leaves your institution, please let us know so that we revoke their CREATE access to EZID. They will continue to be able to maintain all existing identifiers.
If there is a researcher from your institution associated with the project, and if you want to sponsor the access, then we are okay with extending access. Please use the sponsored account order form (see above) to request the new account.
As of August, 2017, only University of California clients are eligible to participate. Please contact us if you have questions about your existing Crossref service account.
EZID and N2T at CDL Presentation at UC DLFx, February 27, 2018
Four Unsolved Problems (with Persistent Identifiers) Presentation at PIDapalooza, Palau de Congressos de Girona, Spain, January 23, 2018
Compact Identifiers for Data Citation in Biomedicine and Beyond Presentation at PIDapalooza, Palau de Congressos de Girona, Spain, January 23, 2018
DOI service providers: 4 factors to consider
Software Citation Principles Presentation at DataCite Strategy Meeting (slides), April 3, 2017
Identifiers and Citation: Frequently Asked Questions Presentation at California Data Librarians conference (slides), March 14, 2017
Identifiers and Citation Webinar for CENDI (slides), Feb. 15, 2017
EZID Postcard for STEM outreach