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An Archival Resource Key (ARK) is a Uniform Resource Locator (URL) that is a multi-purpose identifier for information objects of any type. An ARK contains the label ark: after the URL's hostname, which sets the expectation that, when submitted to a web browser, the URL terminated by '?' returns a brief metadata record, and the URL terminated by '??' returns metadata that includes a commitment statement from the current service provider. The ARK and its inflections ('?' and '??') gain access to three facets of a provider's ability to provide persistence. Implicit in the design of the ARK scheme is that persistence is purely a matter of service and not a property of a naming syntax. Moreover, that a "persistent identifier" cannot be born persistent, but an identifier from any scheme may only be proved persistent over time. The inflections provide information with which to judge an identifier's likelihood of persistence. == Structure == * NAAN: Name Assigning Authority Number - mandatory unique identifier of the organization that originally named the object * NMAH: Name Mapping Authority Host - optional and replaceable hostname of an organization that currently provides service for the object * Qualifier: optional string that extends the base ARK to support access to individual hierarchical subcomponents of an object,〔Hierarchy qualifiers begin with a slash character.〕 and to variants (versions, languages, formats) of components.〔Variant qualifiers begin with a dot character.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Archival Resource Key」の詳細全文を読む スポンサード リンク
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