The result will be a great repository of information accessible to a variety of new applications. This first handbook for the Semantic Web covers, among other topics, software agents that can negotiate and collect information, markup languages that can tag many more types of information in the document, and knowledge systems that enable machines to read Web pages and determine their reliability . The Semantic Web is truly interdisciplinary combines aspects of artificial intelligence, markup languages, natural language processing, information retrieval, knowledge representation, intelligent agents, and databases.