Re: union vs. "or" vs. contains?

Whatever I do, I want to keep processing completely controlled by the configuration file.

Maybe someone on this list who knows Ant better than I do (it's on my list!) can comment on how Ant (a Java build framework) could query a configuration file to determine which stylesheet to call when a job is invoked. A poor man's version of the same (though of course Ant is free) could use a batch file to run a transform on your config file, to create another batch file (in which the delegation could be managed), and then execute it. In other words, these things can be done.

<input
  message="Enter an XSL file name:"
  addproperty="xsl.name"/>

<xslt
  in="source.xml"
  out="result.html"
  style="${xsl.name}"/>

best,
-Rob