[XeTeX] is this a bug?

[Mike Maxwell]

I wrote:
> The original doc (which I simplified to the above minimal 
> doc) was automatically converted from a DocBook document.  So it looks 
> like the problem is with the DocBook converter (the original document, 
> while odd, was validated against the DocBook schema).

Actually, it looks like the problem was with the original document after 
all; I believe it in fact did not validate.  So the converter (dblatex) 
was not at fault, I was.
-- 
    Mike Maxwell
    What good is a universe without somebody around to look at it?
    --Robert Dicke, Princeton physicist