Saxon and linenumbering

Hi,

I have done searches and already read
http://www.oasis-open.org/archives/docbook-apps/200406/msg00101.html.

However in my case linenumbering does not work, despite saxon
extension. I know saxon extension works because I use it to add
callouts and callouts need it. Here is what is working for callouts :

    java -jar ~/local/lib/xxe-std-3_5_2/bin/saxon.jar
programlistingco.xml ~/local/lib/docbook-xsl-1.72.0/xhtml/docbook.xsl
use.extensions=1 callouts.extension=1 >programlistingco.html

Saxon.jar is 6.5.5 version

However if I try :

    java ~/local/lib/xxe-std-3_5_2/bin/saxon.jar linenumbering.xml
~/local/lib/docbook-xsl-1.72.0/xhtml/docbook.xsl use.extensions=1
linenumbering.extension=1 >linenumbering.html

I get :

No numberLines function available.
Processing terminated by xsl:message at line 283

saxon extension used in CLASSPATH is :

    ~/local/lib/docbook-xsl-1.72.0/extensions/saxon65.jar

Thierry B.