Experimental XSLT for transforming oXygen change markup in DocBook docs into DocBook

["Imsieke, Gerrit, le-tex" <gerrit.imsieke@le-tex.de>]

Apologies for cross-posting. Please think about whether the answer is 
most relevant to only one of both mailings lists before replying to both.

I recently wanted to render a large book (DocBook 5.1) that was 
copy-edited in oXygen author mode and that contained the corresponding 
processing instructions, and I wanted to render it with the Ant-based FO 
scenario that displays changes. But for some reason that I could not 
really fathom, neither this FOP scenario nor the default PDF rendering 
scenario produced results, with different error messages. Increasing 
oXygenâs or Antâs heap space to insane amounts didnât improve the 
situation.

Anyway, I didnât need a PDF; HTML would be fine, too, so I decided to 
add an oXygen change markup renderer to Normâs brand new xslTNG 
stylesheets, https://github.com/docbook/xslTNG

Thereâs a pull request to xslTNG where I asked Norm to merge it into 
xslTNG (https://github.com/docbook/xslTNG/pull/67). But since it has 
been hardly tested on many documents, Norm is hesitant to merge it, and 
Iâd like to collect some user feedback first.

Iâd like to ask you to test it on your DocBook files that have been 
enhanced with change markup in oXygenâs author mode. The patched 
renderer is at https://github.com/gimsieke/xslTNG/tree/oxy-markup. You 
probably need Gradle or something to build it yourself, but you can use 
the latest release (https://github.com/docbook/xslTNG/releases) and 
replace the changed files (https://github.com/docbook/xslTNG/pull/67/files).

Or you can just run the stylesheet 
https://github.com/gimsieke/xslTNG/blob/oxy-markup/src/main/xslt/transforms/80-oxy-markup.xsl 
standalone, render the resulting DocBook to HTML and define the CSS 
classes .oxy_insert and .oxy_delete to naybe color:green and color:red, 
respectively.

Please let me know whether it works in principle or whether there are 
bugs or missing features. Also whether thereâs already another 
stylesheet somewhere in place that is supposed to render the oXygen 
change markup PIs.

Gerrit