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(@*) < 20]"
>
> Not tested.
<xf:group class="show-hide" ref=".[count(@*) < 8 or count(*) < 5]">
>
> Michael
>
> --
> ****************************************************************
> * C. M. Sperberg-McQueen, Black Mesa Technologies LLC
> * http://www.blackmesatech.com
> * http://cmsmcq.com/mib
> * http://balisage.net
> ****************************************************************
>
>
>
>
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