Make Your XML RDF-Friendly (O'Reilly)
Suppose you're designing an XML application or maybe just writing a DTD or schema. You've followed various best practices about element and attribute names, when to use elements versus attributes, and other design issues, because you want your XML to be useful in the widest variety of situations. As RDF interest and application development grows, there's an increasing payoff in keeping RDF concerns in mind along with the other best practices as you design document types. Your documents store information, and small tweaks to their structure can allow an RDF processor to see that information as subject-predicate-object triples, which it can make good use of."