I-name synonyms make it easy for humans to discover and address the resource, while i-number synonyms make it easy for machines to maintain a persistent identity for the resource. These different XRIs that all point to the same resource are called synonyms. However the XRI layer is the first architecture that combines a uniform syntax and resolution protocol for both persistent and reassignable identifiers.Īt the XRI addressing layer, most resources will have both i-names and i-numbers. The notion of a third layer for persistent addressing is not new - Uniform Resource Names (URNs) and other persistent identifier architectures have been developed for this purposes. XRIs accomplish this by adding a third layer of abstract addressing over the existing layers: IP numbering (first layer) and DNS naming (second layer). The i-number form of an XRI is designed to serve as an address that does not need to change no matter how often the location of a resource on (or off) the Internet changes. Technically, an i-number is one form of an extensible resource identifier (XRI) - an abstract structured identifier standard developed at Organization for the Advancement of Structured Information Standards for sharing resources and data across domains and applications. By contrast, IP addresses are constantly reassigned, e.g., your computer may have a different IP address every time it connects to the Internet. The other key difference is that i-numbers are persistent, i.e., once they are assigned to a resource, they are never reassigned. For example, if a web page has an i-number, and links to that page use the i-number, then those links will not break even if the page is renamed, the website containing the page is completely reorganized, or the page is moved to another website.Ĭonceptually, an i-number is similar to an IP address, except i-numbers operate at a much higher level of abstraction in Internet addressing architecture. I-numbers are a type of Internet identifier designed to solve the problem of how any web resource can have a persistent identity that never changes even when the web resource moves or changes its human-friendly name.
Not to be confused with Imaginary unit or numbers called "I" or "i".
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