Attaching an XSL style sheet to an XML document is easy. 
Simply insert an xml-stylesheet processing 
instruction in the prolog immediately after the XML 
declaration. This processing instruction should have a 
type attribute with the value 
text/xsl and an href attribute 
whose value is a URL pointing to the style sheet. For 
example:
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href="compositions.xsl"?>
This is also how you attach a CSS style sheet to a 
document. The only difference here is that the 
type attribute has the value 
text/xsl instead of text/css.