[xquery-talk] Re: Debugging

[Per Bothner]

Jason Hunter wrote:
> Which raises an interesting question:  What's the best way people have
> found to *debug* queries?  I notice some engines have log() functions
> which allows printf() style debugging.  That can let you watch some of
> what's going on.  Any other tricks?

The May specification includes a trace(VALUE, STRING) function that
is at least partly intended for debugging.  The latest CVS version of
Qexo include the trace functions.

The second half of the following (draft) article includes some notes
on debugging Qexo.  It is written in the context of web applications
(using servlets), but the debugging notes are generally applicable.
http://www.gnu.org/software/qexo/simple-xquery-webapp.html
-- 
	--Per Bothner
per at bothner.com   http://per.bothner.com/