Hypertext keys

US Environmental Protection Agency (US EPA) (1996) Exposure Factors Handbook. Washington, DC Office of Health and Environmental Assessment, Office of Research and Development, USEPA. Volume I, PB98-124225 Vol. II, PB98-124233 Vol. Ill PB98-124241 and the set of three volumes is PB98-124217. US EPA has also produced a CD-ROM that contains an interactive version of the Exposure Factors Handbook. The CD-ROM has word search capabilities, downloadable tables, hypertext links to various chapters in the document, and key references. 

In order to make the Web work in the way described above, Berners-Lee needed to develop three key elements that would build on top of the features already provided by the Internet. In his book Weaving the Web, he ranks these in the following order Universal Resource Identifiers (URIs), HyperText Transfer Protocol (HTTP), and HyperText Mark-up Language (HTML). 

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