>Combining the XML, DTD and XSL into one file, is it possible?

The XML spec provides for inline Schema, but it is not supported in msxml until MSXML3. XML, XSL, and Schema can all be embedded into a single HTML in the for of data islands. For an example of a document that uses both a XML data island and an XSL "style island" download my macXML class from here in the files section and check out the output.