ABSTRACT
In the first two chapters, we established an initial understanding of the Semantic Web. A typical Web page in the Semantic Web world looks like the one shown in Figure 3.1.
In Figure 3.1, the markup document is the special file we mentioned repeatedly in Chapter 2. It asserts the following fact: the semantics of the term SLR used on this page is the same as that defined in the
vocabulary. This file is indeed quite special; its existence has turned the crawler into a smart agent. When the crawler reaches this page, it follows the link on it to locate this markup file and, furthermore, it is able to “understand” it. With the help of the
file (pointed to by a link in the markup file), the crawler is finally able to understand what this whole page is about. In fact, in Chapter 2 we saw some fairly complex inferences made by the crawler with the help of the markup file.
