e an XSLT directive. In most
 XSLT stylesheets, this is bound to the "xsl:" prefix. It's defined
 by the W3C's XSLT Recommendation.</li>
 <li>S_OLDXSLNAMESPACEURL (http://www.w3.org/XSL/Transform/1.0) was
 used in early prototypes of XSLT processors for much the same purpose
 as S_XSLNAMESPACEURL. It is now considered obsolete, and the version
 of XSLT which it signified is not fully compatable with the final
 XSLT Recommendation, so what it really signifies is a badly obsolete
 stylesheet.</li>
 </ul></DL>