[xquery-talk] Wrapping element conditionally

Misztur, Chris CMisztur at macleanfogg.com
Mon Dec 16 09:33:24 PST 2013

Can you explain this more:

($fn($el)[$bool], $el)[1]

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Chris Misztur | Engineer, Business Systems
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From: James Fuller [mailto:james.fuller.2007 at gmail.com]
Sent: Monday, December 16, 2013 11:10 AM
To: David Lee
Cc: David Carlisle; Misztur, Chris; talk at x-query.com
Subject: Re: [xquery-talk] Wrapping element conditionally

and for a bit of xquery 3.0 fun

xquery version "3.0";

let $apply:= function($bool,$fn,$el){ ($fn($el)[$bool], $el)[1] }

let $wrap := true() ,
    $p := <p>something here</p>

On Mon, Dec 16, 2013 at 6:01 PM, David Lee <dlee at calldei.com<mailto:dlee at calldei.com>> wrote:
FYI the key to understanding XQuery (and XSLT) is that you are not "printing lines" your generating element.  *full elements* with these constructs.
You cant just   printf("<html>")  then later printf("</html>")

You are constructing an entire element including the start, end and body all at once.
So you cant conditionally include or exclude half the markup.

-----Original Message-----
From: talk-bounces at x-query.com<mailto:talk-bounces at x-query.com> [mailto:talk-bounces at x-query.com<mailto:talk-bounces at x-query.com>] On Behalf Of David Carlisle
Sent: Monday, December 16, 2013 11:47 AM
To: Misztur, Chris; talk at x-query.com<mailto:talk at x-query.com>
Subject: Re: [xquery-talk] Wrapping element conditionally

On 16/12/2013 16:28, Misztur, Chris wrote:
> How would I get the output to look like:
> <html><body><p/></body><html>
> Or just:
> <p/>

<html><body><p>something here</p></body></html>/
    (if($wrap) then . else body/p)


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