"PURL" redirects here. For other meanings of "purl", see Purl (disambiguation).
A persistent uniform resource locator (PURL) is a uniform resource locator (URL) (i.e., location-based uniform resource identifier or URI) that is used to redirect to the location of the requested web resource. PURLs redirect HTTP clients using HTTP status codes.
Originally, PURLs were recognizable for being hosted at purl.org or other hostnames containing purl. Early on many of those other hosts used descendants of the original OCLC PURL system software. Eventually, however, the PURL concept came to be generic and was used to designate any redirection service (named PURL resolver) that:[1]
has a "root URL" as the resolver reference (e.g. http://myPurlResolver.example);
provides means, to its user-community, to include new names in the root URL (e.g. http://myPurlResolver.example/name22);
provides means to associate each name with its URL (to be redirected), and to update this redirection-URL;
ensure the persistence (e.g. by contract) of the root URL and the PURL resolver services.
PURLs are used to curate the URL resolution process, thus solving the problem of transitory URIs in location-based URI schemes like HTTP. Technically the string resolution on PURL is like SEF URL resolution.
The remainder of this article is about the OCLC's PURL system, proposed and implemented by OCLC (the Online Computer Library Center).
^Services as URN LEX, ELI and DOI, Permalink and others, they use directly or indirectly the PURL concept.
and 25 Related for: Persistent uniform resource locator information
A UniformResource Name (URN) is a UniformResource Identifier (URI) that uses the urn scheme. URNs are globally unique persistent identifiers assigned...
given ARK. Persistent identifier Digital object identifier (DOI) Handle System (Handle) Persistentuniformresourcelocator (PURL) Uniformresource name (URN)...
search engine-friendly URLs or RESTful URLs) are web addresses or UniformResourceLocator (URLs) intended to improve the usability and accessibility of a...
Web resource. URC metadata was envisioned to include sufficient information to support persistent identifiers, such as mapping a UniformResource Name...
underlying resource and provides only the means to retrieve metadata about the resource. This may be contrasted with a UniformResourceLocator (URL), which...
are identified and located on the network by UniformResourceLocators (URLs), using the UniformResource Identifiers (URI's) schemes http and https. As...
inherent dereferencing mechanism, i.e. a PUID does not resolve to a UniformResourceLocator. However, The National Archives is planning to develop a range...
Supply or Uninterrupted Power Supply URI—UniformResource Identifier URL—UniformResourceLocator URN—UniformResource Name USB—Universal Serial Bus usr—User...
i-number for the target resource—a persistent identifier that will never be reassigned (the functional equivalent of a UniformResource Name). For full details...
including: Descriptive metadata – the descriptive information about a resource. It is used for discovery and identification. It includes elements such...
protocols that use standard HTTP URIs (often called URLs). A UniformResource Name is a persistent, location-independent identifier assigned within the defined...
Retrieved 14 October 2012. Butcher, Simon (January 2003). Uniform ResourceLocator Schemes for Internet Relay Chat Entities. IETF. I-D draft-butcher-irc-url-04...
then known as longstanding persistent AF. If a decision is made by the person and their medical team to accept persistent AF and not attempt restoration...
were granted under National Security Presidential Memorandum (NSPM) 13; persistent cyber engagements at Cyber command are the new norm for cyber operations...
insecticide monocrotophos (MCP) appears to be one of a few hazardous, persistent, soluble and mobile (it does not bind with minerals in soils) pesticides...
of its PRONOM technical registry service. PUIDs can be expressed as UniformResource Identifiers using the info:pronom/ namespace. Although not yet widely...
accessible. Access to electronic documents is provided through PersistentUniform Resources Locators (PURL) and is facilitated by GovInfo and the Catalog of...
on the other produces the tangential force. If the magnetic field were uniform, each side would generate opposing forces that would cancel each other...
dubious studies that show selection bias, the primary factors causing the persistent belief Chernobyl increased the background rate of birth defects. Pregnancy...