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(@*) < 20]"
Not tested.
Michael
--
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* C. M. Sperberg-McQueen, Black Mesa Technologies LLC
* http://www.blackmesatech.com
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* http://balisage.net
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