28.2. Naming web pages
The web is a very large-scale distributed system comprising many millions of documents stored at a large number of servers. The entities in a distributed system must be named uniquely and, as we saw in Chapter 7, there are well-known methods of designing a namespace and achieving unique names. The web uses a naming scheme which covers all kinds of documents, including books as well as web pages, called Uniform Resource Identifiers (URIs). One form of URI is a hierarchical, location-dependent name called a Uniform Resource Locator (URL). The other form of URI is a Uniform Resource Name (URN). A URL is built around the DNS name of the server which holds the document. An example is:
http://www.cl.cam.ac.uk/Research/SRG/opera/publications ...
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