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Subject: DOCBOOK-APPS: How to structure XSL stylesheets for chunking andnon-chunking

Question for those of you working with XSL stylesheets.... for both
my work here at e-smith/Mitel and also some of the stuff I do with the
Linux Documentation Project, I need to generate both chunked and 
non-chunked HTML files from various DocBook files and I need a 
customization layer to modify certain settings in Norm's XSL stylesheets.

With SGML/DSSSL, it seems chunking was handled by the *processor*, so
we all simply passed (open)jade the "-V nochunks" option when we did
NOT want chunking. The DSSSL customization layer could work for both.

With XML/XSL, chunking is handled by the *stylesheet*, so there is now
a need for two stylesheets - one for chunking and one for not.  However,
basically everything in the two stylesheets is the same. What is different
is whether the stylesheet calls Norm's 'html/docbook.xsl' (non-chunking)
or 'html/chunk.xsl' (chunking).

So the question really is - how do you structure a customization layer
to sit on top of Norm's stylesheets?

The solution I have come up with actually uses *three* stylesheets.  

I put all my customizations in an XSL stylesheet called
'e-smith-common.xsl'. This stylesheet does NOT do an <xsl:import> to
Norm's XSL stylesheets.  It just has all my customizations.

I then have two other stylesheets. One is called simply 'e-smith.xsl'
and has the contents:

  <?xml version="1.0"?>
  <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

  <xsl:import href="/usr/share/sgml/docbook-xsl-1.41/html/docbook.xsl"/>
  <xsl:import href="e-smith-common.xsl"/>


The other stylesheet, 'e-smith-chunk.xsl', is the same as the above
except that it imports 'chunk.xsl' instead of 'docbook.xsl'.  Both of
these essentially import the appropriate XSL file from Norm and then
import e-smith-common.xsl.  FYI, I used <xsl:import> instead of
<xsl:include> in case I later decided that I wanted to override
e-smith-common.xsl in one or the other of these files.

So to use them, I just call the appropriate stylesheet. To generate
a single page:

  $ xsltproc -o sample.html /usr/share/sgml/e-smith.xsl sample.xml

To generate multiple pages:

  $ xsltproc /usr/share/sgml/e-smith-chunk.xsl sample.xml

It all works fine, and there is no difference between the files generated
this way and those I generated from my single larger stylesheets before.

So I have a system that works... why I am asking the question? 
Well, does anyone have a better way to do this?  Is there any way to 
NOT have to have two separate stylesheets for chunking or non-chunking?
Is there a way I can have *one* call and call it differently?

Or is the solution I have come up with the best way to do it?

Any thoughts or suggestions are welcome.


Dan York, Director of Training        dyork@e-smith.com
Ph: +1-613-751-4401  Mobile: +1-613-263-4312 Fax: +1-613-564-7739 
e-smith, inc. 150 Metcalfe St., Suite 1500, Ottawa,ON K2P 1P1 Canada
http://www.e-smith.com/            open source, open mind

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