OCLC offers an array of APIs that provide additional access points to WorldCat and the WorldShare platform, allowing libraries and partners to use the data inside applications in new and creative ways. While we add APIs at times, we also must retire some. The xID product, including xISBN, xISSN and xOCLCNum, has experience low usage and will be retired from the OCLC API offering. No new keys are being issued, and the service will be unavailable beginning March 15, 2016. If you have questions or anticipate a need for similar data or services, please contact Tony Chirakos.
Update:
The retirement of the xID product will be delayed while we review options for an alternative service that will deliver some of the most important functionality from xID. While this new service is being developed, we will continue to offer xID, without any changes to the service or data, to current users. A new retirement date will be shared once the new service is available.
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Karen Coombs
Senior Product Analyst