[xsl] XSL FO and change bars

[Jim Melton <jim dot melton at acm dot org>]

Gentlepeople,

I have diligently searched the FAQ and the XSL-List archives without 
finding anything related to this subject.  If I have missed a relevant bit 
of information, I will be grateful for somebody to point me to it.

If I have not missed it, then perhaps this note will stimulate some 
discussion or even a solution.

Many text publishing products (e.g., LaTex, DECdocument, Microsoft Word, 
Adobe Framemaker) have the ability to apply so-called change bars (those 
vertical rules alongside one edge of portions of a document) to indicate 
new or changed bits of text in a document.

I am responsible for producing a series of documents that is frequently 
updated and distributed to a largish group of people for on-going 
development work.  Change bars are essential to allow participants to 
readily see what has changed amongst about 2,000 pages of text.  I am 
currently producing these documents using DECdocument, but am in the 
process of converting them to XML, producing PDF via XSL FO (using 
RenderX's XEP product).

I do not immediately see how to implement change bars through XSLT and XSL FO.

If there is some obvious way, then please tell me and I'll be suitable 
embarrassed.  If there is some non-obvious way, then I will be very pleased 
to learn how to accomplish this.  If there is no known way, then I'll be 
disappointed ;^)

Many thanks for all relevant responses!
    Jim
========================================================================
Jim Melton --- Editor of ISO/IEC 9075-* (SQL)     Phone: +1.801.942.0144
Oracle Corporation            Oracle Email: mailto:jim.melton@oracle.com
1930 Viscounti Drive          Standards email: mailto:jim.melton@acm.org
Sandy, UT 84093-1063           Personal email: mailto:jim.melton@acm.org
USA                                                Fax : +1.801.942.3345
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=  Facts are facts.  However, any opinions expressed are the opinions  =
=  only of myself and may or may not reflect the opinions of anybody   =
=  else with whom I may or may not have discussed the issues at hand.  =
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