[Exist-open] Conditionally Setting Values

[Chris G. <Chr...@wf...>]

Is it possible to conditionally set a value using xf:setvalue. I read in the
T.V.Raman book that the value clause can be "an XPath expression" - which
leads me to understand that I can put an IF, THEN, ELSE in there and the
value to be copied will be the result of this ?

In my XForm this functionality occurs on an XForms-value-changed event and I
want to set a value unless that value is 2.

I have the following in my xf:setvalue:

<xf:setvalue
ref="instance('visit_instance')/visited_site[index('instance_of_visit')]/geo_obj_code" 
                 value="if
(instance('visit_instance')/visited_site[index('instance_of_visit')]/geo_obj_code/@geo_lookup2
!= '2') then
instance('visit_instance')/visited_site[index('instance_of_visit')]/geo_obj_code/@geo_lookup2
else ()"/>


Any suggestions or advice is welcome.

Chris
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