Re: [eXist-TEIXML] A branching problem

[Peter W. <pet...@ke...>]

Yes, I confirm that I could not get the alternatives to work in the 
XPath either.  Peter

On 21/12/2012 15:54, Jens Østergaard Petersen wrote:
>
> On Dec 21, 2012, at 2:20 PM, Adam Retter <ad...@ex... 
> <mailto:ad...@ex...>> wrote:
>
>>
>>     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
>
> Well, then a sequence has to be introduced in the XPath,
>
> collection('/db/punch/data')//(tei:persName, 
> tei:placeName)[@corresp=$corresp]
>
> Strangely, eXist does not handle this correctly, ignoring all but the 
> first item in the sequence ....
>
> Jens
>
>>
>>
>> -- 
>> Adam Retter
>>
>> eXist Developer
>> { United Kingdom }
>> ad...@ex... <mailto:ad...@ex...>
>> irc://irc.freenode.net/existdb <http://irc.freenode.net/existdb>
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