Persistent Uniform Resource Locators (PURL)

A PURL provides a reference to an intermediate resolution service. The PURL resolution service associates the PURL with the actual URL and returns that URL to the client.

A PURL has three parts: (1) a protocol, (2) a resolver address, and (3) a name. A PURL looks like any of the following:

PURLs, also known as Persistent URLs, were developed by the Online Computer Library Center, Inc. (OCLC) in the 1990s.