This should fetch the url http://xformstest.org/cgi-bin/echo.sh?a=1&b=2 if you type 1 and 2 in a and b boxes.
Fetches the url http://xformstest.org/cgi-bin/echo.sh?a=1&b=2&.
A similar is obtained if separator is omitted from xf:submission.
The submission separator is being used as a terminator. The spec should have an erratum already that says this is wrong, as the desired result is HTML 4 compatibility.