The simple answer is because they are not sufficient frameworks. For example, lets say that two different schemas need to be used. One to represent basic information about a document, such as keywords and another a list of people who have approved the document. The basic data structures of RDF, in this case a bag, can be used in both cases. Without RDF, the data structure and how to represent it in XML would have to be described in each schema, potentially in a different way making the metadata more difficult to process.

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