Merging Data from Multiple Sources
We started off describing RDF as a way to distribute data over several sources. But when we want to use that data, we will need to merge those sources back together again. One value of the triples representation is the ease with which this kind of merger can be accomplished. Since information is represented simply as triples, merged information from two graphs is as simple as forming the graph of all of the triples from each individual graph, taken together. Let’s see how this is accomplished in RDF.
Suppose that we had another source of information that was relevant to our example from Table 3.3—that is, a list of plays that Shakespeare wrote or a list of parts of the United Kingdom. These would be represented ...
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