[xep-support] Maximum Change Version in footer by page

[G. Ken Holman]

At 2007-09-27 17:20 -0400, jalinares at cox.net wrote:
>I am trying to add the maximum version of changes found on a page. 
>fo:marker and fo:retrieve only allow me to display the first and 
>last occurrence that are on each page. Is there an easy way to get 
>the max value of node by page?

Yes, but it is a trick, not a feature.  XSL-FO does not offer the 
arbitration between retrieved markers.  In my training material this 
is demonstrated as implementing classification levels in secure 
documents (classified, secret, top secret, etc.) on a page basis.

(1) - choose a unique marker class for each version, using the text of
       the version number as the text of the marker class

(2) - in the perimeter region render all of the possible marker classes,
       one at a time, each in a separate absolutely-positioned block
       container positioned at the identical location with identical size
     - assign a higher z-index= property to each block container for each
       version retrieved
     - in each block container render a block with a solid background the
       same colour as the perimeter background
     - retrieve the marker class into this block

You get the desired effect because the highest z-index= retrieved 
obscures the lesser ones and any higher ones not retrieved are empty 
blocks that do not obscure the highest retrieved.

I hope this helps.

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

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