Re: [Xsltforms-support] hiding/displaying groups

[C. M. Sperberg-M. <cm...@bl...>]

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)]"

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.

Michael

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* C. M. Sperberg-McQueen, Black Mesa Technologies LLC
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