By G Antoniou; Frank Van Harmelen
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Extra info for A semantic Web primer
The ﬁrst users decided to adopt HTML because it had been adopted as a standard and they were expecting beneﬁts from being early adopters. Others followed when more and better Web tools became available. And soon HTML was a universally accepted standard. Similarly, we are currently observing the early adoption of XML. While not sufﬁcient in itself for the realization of the Semantic Web vision, XML is an important ﬁrst step. Early users, perhaps some large organizations interested in knowledge management and B2B e-commerce, will adopt XML and RDF, the current Semantic Web-related W3C standards.
While this layer has not yet been fully deﬁned, the principles to be adopted are quite clear, so it makes sense to present them. Chapter 6 discusses several application domains and explains the beneﬁts that they will draw from the materialization of the Semantic Web vision. Chapter 7 describes the development of ontology-based systems for the Web and contains a miniproject that employs much of the technology described in this book. Finally, chapter 8 discusses brieﬂy a few issues which are currently under debate in the Semantic Web community.
The problems arise from the fact that the HTML document does not contain structural information, that is, information about pieces of the document and their relationships. 1 Introduction 25 cessible to machines because every piece of information is described. Moreover, their relations are also deﬁned through the nesting structure. For example, the