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Re: [xsl] Controlling process flow in a stylesheet?


Subject: Re: [xsl] Controlling process flow in a stylesheet?
From: "Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 22 Aug 2014 18:07:53 -0000

Hi,

There's also the very literal-minded

if (exists(A)) then A else $A,
if (exists(B)) then B else $B

Or ... how about (as long as sequence $A has only one member)...?

$A/(current()/A , .[empty(current()/A)]

With apologies, it's Friday.

Cheers, Wendell


On Thu, Aug 21, 2014 at 5:30 PM, Michael Kay mike@xxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> I thought of doing it that way, and I often do it that way, but the function
call (a) adds a little bit of abstraction, and (b) can handle the case where
there are several A (or B etc) children.
>
> Michael Kay
> Saxonica
> mike@xxxxxxxxxxxx
> +44 (0) 118 946 5893
>
>
>
>
> On 21 Aug 2014, at 19:53, Michael MC<ller-Hillebrand mmh@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Am 21.08.2014 um 19:59 schrieb Michael Kay:
>>
>>> If the parent has a content model A, B, C, D, and any of the four might be
absent, then you could try doing
>>>
>>> <xsl:apply-templates select="optional(A, $A), optional(B, $B), optional(C,
$C), optional(D, $D)"/>
>>>
>>> where optional(X, Y) is a function that selects X if present or Y
otherwise, and $A, $B etc are global variables containing default elements of
each type (or some other marker to indicate that the element is absent).
>>
>> Can the function be avoided by writing
>>
>> <xsl:apply-templates select="(A, $A)[1], (B, $B)[1], (C, $C)[1], (D,
$D)[1]"/>
>>
>> This method was mentioned earlier in this list and I used it since several
times as a method to handle default values.
>>
>> - Michael
>>
>



--
Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
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