Examples
Worked examples
- Is an instance
https://w3id.org/dpv (a W3C Permanent Identifier Community Group PURL for the Data Privacy Vocabulary).
- Is an instance
An archive.org-style PURL redirecting an old URL to its current location.
Counter-examples
Looks similar, but isn't
- Not an instance
A bit.ly shortener link is not a PURL, even though it redirects, because it is not run as a curated persistent-naming service.
- Not an instance
A canonical-link <link rel='canonical'> tag is not a PURL.
Editorial commentary
PURLs were introduced by OCLC in 1995 to address the link-rot problem on the early Web. A PURL service operates a redirect table; users cite the PURL, and the maintainer keeps the redirect target current. The original OCLC PURL service was retired in 2016, and the registered PURLs were migrated. Today PURL-style services are run by archive.org’s Internet Archive PURL, w3id.org (W3C Permanent Identifier Community Group), and various domain-specific resolvers.
References
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Also known as
Persistent Uniform Resource Locator · Persistent URL
Machine-readable encodings
Use in your systems
<role vocab="credit"
vocab-identifier="https://casrai.org/dictionary/"
vocab-term="PURL"
vocab-term-identifier="https://casrai.org/dictionary/term/purl" />{
"@context": "https://schema.org",
"@type": "DefinedTerm",
"name": "PURL",
"identifier": "https://casrai.org/dictionary/term/purl",
"description": "Persistent Uniform Resource Locator, a URL maintained by a PURL service that redirects (typically via HTTP 302) to the current location of the named resource, allowing the persistent URL to remain stable as the underlying resource location changes.",
"inDefinedTermSet": "https://casrai.org/dictionary/domain/the-persistent-identifier-ecosystem/",
"url": "https://casrai.org/dictionary/term/purl",
"sameAs": [
"Persistent Uniform Resource Locator",
"Persistent URL"
],
"license": "https://creativecommons.org/licenses/by/4.0/"
}
