Using barcode markup in Saxon/Oxygen

Hi

How can I get barcode markup like below working in an XSLT stylesheet
outputting XSL-FO/pdf, using Saxon XSLT 2.0 processor and FOP from
inside Oxygen XML Editor?

I guess I need to declare some Saxon namespace on the stylesheet root
element, instead of the one below or what?
And maybe I need to install something first?

<fo:instream-foreign-object>								
 <barcode:barcode xmlns:barcode="http://barcode4j.krysalis.org/ns"
msg="{$taskcard}">

  et cetera...

 </barcode:barcode>
</fo:instream-foreign-object>


Cheers
Jesper Tverskov
http://www.xmlplease.com