Hello, I know that, this is a little bit off-topic, but I think, someone on the list can answer this question. The developer guide states, that xindice uses the xupdate implementation provided by Infozone Group. I browsed their site, which means the lexus part (http://www.infozone-group.org/projects_main.html), but I was not able to find a link, where I could download the implementation.
Another question is, if the work on this implementation will be continued. The last changes where made on Feb 1th in 2001. Is XUpdate maintained of will it be replaced by XQuery. At w3c.org I can't find the working draft any more. Best regards, Wolfram