For example: we have files of the type .ckl which is really an xml formatted file generated by the STIG viewer (DoD requirements), which the DoD provides an .xslt style sheet for. I would be nice to be able to associate .ckl files with a registered xml style sheet in collaborator. This would makes review and Markup, much easier.
To extend the functionality in a more generic way, if a file was .xml file; and I had several sytle sheets registered for .xml files, if the default style sheet, was None, or styleA.xslt, during the review allow the user to specify a different .xslt either in the settings tab, or by right-clicking on the .xml file name and selecting a different style sheet.