On the Internet, a persistent uniform resource locator (PURL) is a uniform resource locator (URL) (i.e.: location-based URI) that does not directly describe the location of the resource to be retrieved, but, instead, describes an intermediate (more persistent) location, which, when retrieved, results in redirection (e.g.: via a 302 HTTP code) to the current location of the final resource. A Uniform Resource Locator, URL (either pronounced as earl — IPA: (American) or (British) — or spelled out), or Web address, is a standardized address name layout for resources (such as documents or images) on the Internet (or elsewhere). ... A Uniform Resource Identifier (URI), is an Internet protocol element consisting of a short string of characters that conform to a certain syntax. ... Resources comprise the base material for an activity or industry: See resource (economics) for the term as used in economics See human capital for human resources (HR) and innovation See natural resources for material matter See resource (computer science) for the computer science meaning of resources See resource (political) relating... Persistence is the term used in computer science to describe a capability used by a computer programmer to store data structures in non-volatile storage such as a file system or a relational database. ... HTTP (for HyperText Transfer Protocol) is the primary method used to convey information on the World Wide Web. ...
PURLs are an interim measure—while URNs are being mainstreamed—to solve the problem of the lack of persistence (over time) of URIs in location-based URI schemes like HTTP. Currently, persistence problems are caused by the practical impossibility of every user having their own domain name, and the hassle and money involved in re-registering domain names, that result in WWW authors putting their documents in rather arbitrary locations of questionable persistence (i.e.: wherever they can get the WWW space). Existing official PURLs (on Purl.Org) will probably be mapped to a URN namespace at a later date. A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn scheme, and does not connote availability of the identified resource. ... A domain name is the unique name of a computer on the Internet that distinguishes it from the other systems on the network. ...
PURLs are an interim measure - while Uniform Resource Names (URNs) are being mainstreamed - to solve the problem of the lack of persistence (over time) of URIs in location-based URI schemes like HTTP.
Currently, persistence problems are caused by the practical impossibility of every user having their own domain name, and the hassle and money involved in re-registering domain names, that result in WWW authors putting their documents in rather arbitrary locations of questionable persistence (i.e.
If the PURL exists the reply is a redirect to the last URL associated with it as specified by its maintainer.
Because the yarn holding rows together is all on the front, and the yarn holding side-by-side stitches together is all on the back, stockinette fabric has a strong tendency to curl toward the front on the top and bottom, and toward the back on the left and right side.
Different combinations of knit and purl stitches, along with more advanced techniques, generate fabrics of considerably variable consistency, from gauzy to very dense, from highly stretchy to relatively stiff, from flat to tightly curled, and so on.
Other simple textures can be made with nothing but knit and purl stitches, including garter stitch, ribbing, and moss and seed stitches.
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