t elements, xsl:element,
xsl:attribute, or xsl:comment. The value "xx:fop" (xx is any non-default namespace)
 indicates that output will be directed to the
<a href="http://xml.apache.org/fop">Formatting Object Processor</a> (FOP) produced by James Tauber: this
must be separately installed, it is not part of SAXON. Alternatively output can be directed
 to a user-defined
Java program by specifying the name of the class as the value of the method attribute, prefixed by
a namespace prefix, for example "x