DOCBOOK: custom xsl stylesheet and import path

[Johannes Zellner <johannes@zellner.org>]

Hi,

I'm using a custom xsl sheet which imports chunk.xsl:

  <xsl:import href = '/home/joze/docbook/xsl/docbook-xsl-1.49/html/chunk.xsl'/>

But as I build the document on different systems with different paths to
chunk.xsl I'd rather like to make this a configurable path, e.g. with
an environment variable. I'm currently using saxon for the translation.
Can I have something like

  <xsl:import href = '$PATH_TO_DOKBOOK/chunk.xsl'/>

??

-- 
   Johannes