DOCBOOK-APPS: import of website.xsl tries to connect tohttp://docbook.sourceforge.net/...

Hello,

I try to transform a XML document written with the website.dtd into 
HTML. Unfortunately the XSL file needs an external resource:

xsltproc --catalogs -o index.html 
../../../data/website/2.3/xsl/website.xsl  index.xml

xmlNanoHTTPConnectAttempt: Error connecting to remote host - Connection 
refusedxmlNanoHTTPConnectAttempt: Error connecting to remote host - 
Connection refusedwarning: failed to load external entity 
"http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl"
compilation error: file ../../../data/website/2.3/xsl/website-common.xsl 
line 20 element import
xsl:import : unable to load 
http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
*** Error code 5

But I am not always at my office, so it can by that I don't have a 
internet connection. Is there a way to force it to use the local 
installation of these XSL files? Something similar to the CATALOG files 
for DTD resolution?

Thanks,

Oliver