DOCBOOK-APPS: Processing Instructions (like php) from xml into html

Hi all,

is there a way to get processing instructions passed through from
the xml source into html (using xsl)?

example:

...can be found in <ulink url="../tutorials/WHG/wsh.pdf">
   Syntax Highlighting in WinEdt</ulink>
   [pdf; <?php show_size("..tutorials/WHG/wsh.pdf"); ?>  KB]
...

Thanks in advance,
Georges