Re: [eXist-TEIXML] A branching problem

[Adam R. <ad...@ex...>]

>
>
> Please excuse if I'm misunderstanding what you are trying to do. I assume
> you want to search both, persName and placeName, if both parameters are
> set? In this case you need to combine the two selections, e.g. with a union:
>
> let $name-predicate :=
> local:get-name-predicate(request:get-parameter('people',''))
> let $place-predicate :=
> local:get-name-predicate(request:get-parameter('place',''))
>
>
> return
>     (if($name-predicate) then
> (collection('/db/punch/data')//tei:persName[@corresp=$name-predicate]) else
> ())
> union
>     (if($place-predicate) then
> (collection('/db/punch/data')//tei:placeName[@corresp=$place-predicate])
> else ())
>
> Wolfgang
>


I think you could also avoid the union altogether. Wolfgang, would this be
more efficient?

let $corresp := (local:get-name-predicate(request:get-parameter('people'
,'')),  local:get-name-predicate(request:get-parameter('place,''))) return
   collection('/db/punch/data')//tei:persName[@corresp=$corresp])

Thats the beauty of a language without null's where an empty sequence is a
perfectly valid 'thing' to operate upon :-p


-- 
Adam Retter

eXist Developer
{ United Kingdom }
ad...@ex...
irc://irc.freenode.net/existdb