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URI schemes registered with the IANA, both provisional and fully approved, are listed in its registry for Uniform Resource Identifier (URI) Schemes. These include well known ones like: file - File URI scheme; ftp – File Transfer Protocol; http – Hypertext Transfer Protocol; https – Hypertext Transfer Protocol Secure
An Identifiers.org URI is formed of several parts: Protocol. Identifiers.org URIs are HTTP URIs and start with "http:/" Data collection. These are namespaces listed in the MIRIAM Registry. For instance "pubmed" for the publication resource PubMed, "ec-code" for the enzyme nomenclature and "go" for gene ontology; Record in the collection.
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.
The Internationalized Resource Identifier (IRI) is an internet protocol standard which builds on the Uniform Resource Identifier (URI) protocol by greatly expanding the set of permitted characters. [1] [2] [3] It was defined by the Internet Engineering Task Force (IETF) in 2005 in RFC 3987.
URI = scheme ":" ["//" authority] path ["?" query] ["#" fragment] A component is undefined if it has an associated delimiter and the delimiter does not appear in the URI; the scheme and path components are always defined. [13]: §5.2.1 A component is empty if it has no characters; the scheme component is always non-empty. [13]: §3
A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3]
Well-known URIs are Uniform Resource Identifiers defined by the IETF in RFC 8615. [1] They are URL path prefixes that start with /.well-known/.This implementation is in response to the common expectation for web-based protocols to require certain services or information be available at URLs consistent across servers, regardless of the way URL paths are organized on a particular host.
The minimal data URI is data:,, consisting of the scheme, no media-type, and zero-length data. Thus, within the overall URI syntax, a data URI consists of a scheme and a path, with no authority part, query string, or fragment. The optional media type, the optional base64 indicator, and the data are all parts of the URI path.