Re: I propose the XML Schema 1.1 <assert> element support user-friendly diagnostic messages via the XPath trace() function

>             <xs:assert test="if (xs:time(start) lt xs:time(end)) then
>
>                                                      true()
>
>                                                else
>
>                                                       trace(false(), 'Hey,
> the meeting ends before it begins!')" />
>
...
> Notice that I am using the XPath trace() function. It the assertion fails, I
> would like the XML Schema validator to output this user-friendly diagnostic
> message:
...
> I propose that the XPath trace() function be overloaded in an XSD context to
> generate user-friendly error messages.

When I did a small test framework a while back I had any non true
value returned as the failure message, so you could do something like:

if (a > b) then true() else concat(a, ' is not greater than ', b)

If true() was returned the test passed, anything else would be a fail
and the value shown to the user.

Not much help here, but I just thought I'd mention it :)



-- 
Andrew Welch
http://andrewjwelch.com