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A file URI has the format file://host/path. where host is the fully qualified domain name of the system on which the path is accessible, and path is a hierarchical directory path of the form directory/directory/.../name. If host is omitted, it is taken to be "localhost", the machine from which the URL is being interpreted.
A URI has a scheme that refers to a specification for assigning identifiers within that scheme. As such, the URI syntax is a federated and extensible naming system wherein each scheme's specification may further restrict the syntax and semantics of identifiers using that scheme. The URI generic syntax is a superset of the syntax of all URI schemes.
General format Notes admin : URL scheme in the GNOME desktop environment to access file(s) with administrative permissions with GUI applications in a safer way, instead of sudo, gksu & gksudo, which may be considered insecure GNOME Virtual file system: admin:/ path / to / file example: gedit admin:/etc/default/grub. See more information on:
ASCII code points that are invalid URI characters may be encoded the same way, depending on implementation. [6] This conversion is easily reversible; by definition, converting an IRI to an URI and back again will yield an IRI that is semantically equivalent to the original IRI, even though it may differ in exact representation. [7]
A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn scheme.URNs are globally unique persistent identifiers assigned within defined namespaces so they will be available for a long period of time, even after the resource which they identify ceases to exist or becomes unavailable. [1]
The data URI scheme is a uniform resource identifier (URI) scheme that provides a way to include data in-line in Web pages as if they were external resources. It is a form of file literal or here document .
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A URL is a specific type of Uniform Resource Identifier (URI), [2] [3] although many people use the two terms interchangeably. [4] [a] URLs occur most commonly to reference web pages (HTTP/HTTPS) but are also used for file transfer , email , database access , and many other applications.