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Ann: PSMI - Interleaving geometry in XSLFO page sequence flows

From: G. Ken Holman <gkholman@CraneSoftwrights.com>
Date: Mon, 18 Mar 2002 19:22:50 -0500
Message-Id: <>
To: XSLFO-WWW <www-xsl-fo@w3.org>
We are pleased to announce a free resource that may make XSLFO stylesheet 
writing easier for you in a very specific situation that would otherwise be 
very awkward to accommodate.  Not many people will need this, but we feel 
it will be very helpful to anyone who does.

In my work with landscape tables in XSLFO, I found myself constricted by 
the packaging of top-level block constructs inside of XSLFO page sequences 
because I needed to change the geometry of the page from portrait to 
landscape based on a single construct being placed in the flow of a 
portrait-oriented page sequence.

It can be done without any kind of extension or customized semantic, but 
consider the difficulty writing XSLT to process deeply nested structure 
where one construct deep within the structure (the landscape table) 
requires a different page geometry than the remainder of the document.

Rather than try and implement a recursive hunt of called named templates 
through nested structure down until the preceding sibling of the changed 
page geometry, packaging all that in a page sequence, processing the 
changed page geometry in a standalone page sequence and then hunting down 
again the next package of top-level constructs for the old page geometry, I 
felt a two-stage process would be a lot easier to write, debug, understand, 
and maintain.

The Page Sequence Master Interleave (PSMI) semantic and vocabulary allows 
one to add inside a page sequence flow the interleaving of other page 
geometries for top-level constructs.  The PSMI stylesheet then unbundles 
the original page sequence into as many sibling page sequences as is 
required to accommodate the interleaved requests for different page 
geometries.  This relieves the stylesheet writer from having to do it while 
navigating nested structure.

Please find this resource and a more detailed description by going to our 
Resource Library (third link from the top of our home page noted 
below).  We've made this a public resource for anyone to use.  If you have 
any bugs to report or suggestions for us to consider, we would be pleased 
to hear from you.


.......................... Ken

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G. Ken Holman                mailto:gkholman@CraneSoftwrights.com
Crane Softwrights Ltd.         http://www.CraneSoftwrights.com/f/
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Received on Monday, 18 March 2002 19:27:19 UTC

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