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URN

Uniform Resource

Identifies a resource by name. It always starts with the prefix urn: For example:

  • urn:isbn:0451450523 to identify a book by its ISBN number.

  • urn:uuid:6e8bc430-9c3a-11d9-9669-0800200c9a66 a globally unique identifier

  • urn:publishing:book - An XML namespace that identifies the document as a type of book.\ URNs can identify ideas and concepts. They are not restricted to identifying documents. When a URN does represent a document, it can be translated into a URL by a "resolver". The document can then be downloaded from the URL.