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Extra resources for XML Topic Maps, Creating and Using Topic Maps for the Web
30 Explicit Referencing XTM has a mechanism to express explicitly the nature of the information being referenced. If it's a topic, then it's referenced using a topicRef element. However, if it's a resource, there are two options, as described below. Studying the possibilities of convergence between topic maps and the RDF specification led us to the realization that when we are addressing a resource in topic maps, there are two cases that need to be distinguished: (1) the case where the resource itself is (or constitutes) the subject of a topic (for example, if a topic is a specific Web page) and (2) the case where the subject of the topic is indicated by the resource (for example, if the Web page is about a product that is the actual subject of the topic).
How, for example, are computers supposed to understand what the tags mean? The "ship-name" tag, by itself, could easily be misunderstood as indicating the beginning of the name of the recipient of some sort of shipment of merchandise, for example. Let's forget about computers for a moment and consider human beings instead. No matter which natural language you choose, most of the people on this planet can't read it. Even those who can read English may use a local dialect that may cause them to be misled as to the significance of a tag name.
All such documents, regardless of their schemas, are parsable by a single standard parsing technology, without reconfiguration. It's obvious that a relational table is exportable and importable as a sequence of named or numbered rows, each of which is itself a sequence of named or numbered fields. 40 41 The Document Object Model (DOM) recommended by the World Wide Web Consortium (W3C) provides a convenient application programming interface (API) to the syntactic structure of information being interchanged in the form of XML documents.