Trying to HTML chunk DocBook XML

[Paul Johnson]

I'm new to Xalan and DocBook and am still just a 'user'. I have a simple 
question I cannot find a simple answer to anywhere - so I'm wondering if 
the problem is a Xalan setup issue or bug.

After successfully using Xalan 1.3 under RH Linux 6.0 to generate HTML from 
DocBook XML using Norman W's DocBook XSL v1.48 with the following command 
line...

Xalan -v -o myfile.html myfile.xml docbook/docbook-xsl-1.48/html/docbook.xsl
...I tried producing chunked HTML by simply referencing chunk.xsl in place 
of docbook.xsl, without changing anything else, as so:

Xalan -v -o myfile.html myfile.xml docbook/docbook-xsl-1.48/html/chunk.xsl
I get the following error:
XSLT warning: Don't know how to chunk with Apache Software Foundation, 
style tree node: xsl:message, source tree node: book (, line-1, column -1)

What does it all mean? Is the world coming to an end, or am I meant to do 
something explicit with Xalan when I use chunk.xsl?

Cheers
Paul J