I discovered Stylus Studio, a great XML editor from Sonic. It does all the usual XML, Schema, DTD stuff, but also edits XSLT and XQuery -- with interactive debugging. I found out about it from a comment by Michael Kay on the Saxon mailing list.
... until the collector arrives ...
This "blog" is really just a scratchpad of mine. There is not much of general interest here. Most of the content is scribbled down "live" as I discover things I want to remember. I rarely go back to correct mistakes in older entries. You have been warned :)