Re: [Xsltforms-support] hiding/displaying groups

[Jens Ø. P. <oe...@gm...>]

Hello Michael,

Thank you for laying out the law!

Both your rewritings work fine. I wonder which one is the fastest?

Regards,

Jens

On Jul 10, 2012, at 9:55 PM, C. M. Sperberg-McQueen wrote:

> 
> On Jul 10, 2012, at 5:01 AM, Alain Couthures wrote:
> 
>> Hello Jens,
>>> I have groups for hiding/displaying a set of buttons for inserting missing elements and attributes. They are at times monstrously long, such as,
>>> 
>>> <xf:group class="show-hide" ref=".[not(@altRepGroup)] | .[not(@authority)] | .[not(@authorityURI)] | .[not(@displayLabel)] | .[not(@ID)] | .[not(@lang)] | .[not(@nameTitleGroup)] | .[not(mods:nonSort)] | .[not(mods:partName)] | .[not(mods:partNumber)] | .[not(@script)] | .[not(mods:subTitle)] | .[not(@supplied)] | .[not(mods:title)] | .[not(@transliteration)] | .[not(@type)] | .[not(@usage)] | .[not(@valueURI)] | .[not(@xml:lang)] | .[not(@xlink:href)]">
>> First, I would try to minimize such expressions like this, if there is 
>> one char that should not appear in values:
>> .[not(contains(concat('~',@altRepGroup,'~',@authority,'~',@authorityURI,'~',@displayLabel,'~',@ID,'~',@lang,'~',@nameTitleGroup,'~',.....,'~'),'~~'))] 
> 
> For the case where we don't have any guarantees about the values
> (so concatenating with '~' or any other magic character is not safe), I 
> wonder (just thinking out loud here) if applying DeMorgan's Law to
> produce a simpler expression would help:
> 
>  ref=".[not(@altRepGroup and @authority and @authorityURI and ...
>               ... and @xlink:href)]"
> 

<xf:group class="show-hide" ref=".[not(mods:partName and mods:partNumber and @script and mods:subTitle and @supplied and mods:title and @transliteration and @type and @usage and @valueURI and @xml:lang and @xlink:href)]">

> Or even (if your list is all the attributes that are possible, which is 
> alas probably not the case)
> 
>  ref=".[count(@*) &lt; 20]"
> 
> Not tested.

<xf:group class="show-hide" ref=".[count(@*) &lt; 8 or count(*) &lt; 5]">

> 
> Michael
> 
> -- 
> ****************************************************************
> * C. M. Sperberg-McQueen, Black Mesa Technologies LLC
> * http://www.blackmesatech.com 
> * http://cmsmcq.com/mib                 
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