Transcription: By now you know how to create XML documents. You can structure your data, you can create well-formed documents that are also valid. You can do things like reference external entities, create large physical structures with your XML document, create modular document type definitions. You've really seen a lot of the power and the capability of XML as a data representation language. Now the question comes, what can you do with it? Well that's what we're going to talk about now.