The combination of *actions* (like <tt>save</tt>) and *request parameters* (like <tt>xredirect</tt>) obviously is a very powerful means to work with XWiki documents. Is there any documentation on that? Where do these concepts belong to in the first place, Struts, XWiki, Velocity or another technology?

an afterthought. I wonder if we cannot somehow merge the concepts together. I guess I'd need to see some examples for this.