Extension instructions (XSLT only)
A Saxon extension instruction is invoked using a name such as
saxon prefix (or whatever prefix you choose to use) must be associated with
the Saxon namespace URI
http://saxon.sf.net/. The prefix must also be designated as
an extension element prefix by including it in the
attribute on the xsl:stylesheet
element, or the
xsl:extension-element-prefixes attribute on any enclosing literal result element or extension element.
However, top-level elements can be used without designating the prefix as an extension element prefix.
The extension instructions and declarations are: