Make use of processing instructions to associate a CSS stylesheet with XML.
<?xml-stylesheet type="text/css" href="document.css"?> <document> ... </document>
Use 'xml-stylesheet' to identify that this is a processing-instruction directed at stylesheet languages.
Use 'type="text/css"' to distinguish from other stylesheet languages.
Use 'href="document.css"' to identify the css stylesheet location.
Most browsers will follow this processing instruction.