I have uploaded a new version of DocbookInContext.
This version has an implementation of attribute actions on an experimental basis; see the file Customization for an explanation and details. Of course the release also contains numerous new small features and fixes. The release has been tested with the Context version of 4 March 2003.
Known problem of this release: Sometimes Context inserts a spurious pagebreak; this seems to be connected with the use of backgrounds. I have noted a similar problem with the Index.
You can find DocbookInContext at http://www.hobby.nl/~scaprea/context/.