Incomplete FLWOR expression: expecting 'return'

问题

I am having some trouble with the if-then-else command of the XQuery.

Currently I am using BaseX to edit XQuery (if that matters!)

if ($item/pf3:Current/pf3:Name) then (
    let $Name := "None"
) else (
    let $Name := data($item/pf3:Current/pf3:Name)
)

This piece throws an error saying: [XPST0003] Incomplete FLWOR expression: expecting 'return'.

回答1:

There is a small problem with your xquery. Here is the corrected version -

let $Name :=
if ($item/pf3:Current/pf3:Name) 
then "None" 
else data($item/pf3:Current/pf3:Name)

If there are no return statements following the above assignment statement, you can append the following return statement after the above statements -

return $Name

来源：https://stackoverflow.com/questions/36562739/incomplete-flwor-expression-expecting-return