Uniform Resource Identifier

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Uniform Resource Identifiers (URIs) are a means of identifying resources, epsecially but not exclusively on the Web. URIs have two main uses, and one URI can be used in both senses:

  • Uniform resource names (URNs) are URIs that are used to name something, even if this is an abstract object that is not available on the Web. For example, a person can have a URI that is used in ontologies to refer to that person.
  • Uniform Resource Locators (URLs) are URIs that are used to specify the location of something. URIs must start with a protocol identifier, and URLs typically use protocols that have a well-established technical interpretation that tools can use to access the specified location (e.g. "http").

URIs have been extended to IRIs that allow further symbols. Since this is generally considered a good thing, many more recent works silently assume that IRIs are meant even if the more established term "URI" is used. Further background information can be found in the Wikipedia article about Uniform Resource Identifier.


Syntax and structure of URIs should be specifed here.

[file:///c://documents%20and%20settings/Administrator/My%20Documents/BAO/UGIS_UNICREDIT/UGIS_UNICREDIT\EA_Unicredit_20_5_10_v4.owl file:///c://documents and settings/Administrator/My Documents/BAO/UGIS_UNICREDIT/UGIS_UNICREDIT\EA_Unicredit_20_5_10_v4.owl]== Examples ==

Provide some examples here, including less common protocols

External links[edit]

Links to further (historic) RFCs missing