In the following the

xsl:

namespace prefix is used to mean "http://www.w3.org/XSL/Transform/1.0". In fact all namespace URI's beginning with "http://www.w3.org/XSL/Transform" are considered as the XSLT namespace. The namespaces "http://www.w3.org/1999/XSL/Transform" and "http://www.w3.org/TR/WD-xsl" are recognized as synonymous. No other namespace URI's have special significance.