DOCBOOK-APPS: & in url attr. of ulink

Given the line

<ulink url="http://some.host.net/index.php3?para1=X&para2=Y">xxx</ulink>

(open)jade logically complains like:

  general entity "para2" not defined and no default entity

because of the '&'.

The only workaround which comes to my mind is replacing '&' with '%26'
or is there any other way to keep the '&' in the resulting URL (I mean
seeing in the browser "...&para2=Y" instead of "...%26para2=Y")

Michael
-- 
                              http://www.miwie.org