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Data Integration on the Web
The World Wide Web offers a vast array of data in many forms. The majority of this data is structured for presentation not to machines but to humans, in the form of HTML tables, lists, and forms-based search interfaces. These extremely heterogeneous sources were created by individuals around the world and cover a very broad collection of topics in over 100 languages. Building systems that offer data integration services on this vast collection of data requires many of the techniques described thus far in the book, but also raises its own unique challenges.
While the Web offers many kinds of structured content, including XML (discussed in Chapter 11) and RDF (discussed in Chapter 12), the predominant representation ...
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