Oxygen XML Forum

Posted: **Tue Aug 18, 2015 10:35 pm**

When I use Saxon 9.6 to run a transformation, and it comes across a statement such as this...

<value-of select ="if ($a) then $a else $b"/>

...it is evaluating $b whether or not $a is true. For a full discussion, along with result discrepancies, see here:
http://stackoverflow.com/questions/3207 ... alculation

Any suggestions on how to rectify this? Thanks!

Posted: **Fri Aug 21, 2015 5:58 pm**

Hi,

You haven't mentioned if you are running this in Oxygen as a transformation scenario or in the XSLT debugger. I'm guessing it's the latter, due to the fact that variables are eagerly evaluated only in the debugger (tracing enabled).
Note that this doesn't have anything to do with the expression used, it's only the fact that you are using a variable there and all used variables are evaluated eagerly when debugging.
If you want consistent results, don't use variables and expect them to be lazily evaluated, use functions instead. e.g.

Code: Select all

<value-of select ="if ($a) then $a else eg:very-long-func()"/>

Regards,
Adrian

Oxygen XML Forum

Saxon evaluating functions and variables unnecessarily

Saxon evaluating functions and variables unnecessarily

Re: Saxon evaluating functions and variables unnecessarily