Is there an ask query for pages in [[Category:A]] AND NOT [[Category:B]]?

[Dan Bolser-3]

I would like to query for all pages that have been assigned
[[Category:A]] but not [[Category:B]]. I tried various 'obvious'
syntax, such as:

{{#ask: [[Category:A]] ![[Category:B]] ... /
{{#ask: [[Category:A]] [[Category:!B]] ...


But nothing seems to work.


I can query for a simple combination of categories. If I wanted a list
of pages that were in [[Category:A]] AND/OR [[Category:B]], I would
just say:

{{#ask: [[Category:A]] [[Category:B]] ... /
{{#ask: [[Category:A||B]] ...


http://test.referata.com/wiki/Tq


It seems that if I created a property called 'has category', I could
do what I wanted. Is there a special reason why categories are handled
different from properties with regards to querying (specifically
negating)? Or have I just made a mistake in my syntax / reading?

I can't seem to find this mentioned in the manual or discussed in the
mailing list.


Thanks for any comments,
Dan.

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[lalquier]

It is not possible to query on properties that are not set - only on  
existing values.

For complex operations on categorization, I found it is more  
convenient to keep only one category per page, as a master Type for  
that page , and use properties for more complex structures.

- Laurent Alquier
Http://www.Alquier.org


On Nov 5, 2009, at 11:11 AM, Dan Bolser <dan.bolser@...> wrote:

> I would like to query for all pages that have been assigned
> [[Category:A]] but not [[Category:B]]. I tried various 'obvious'
> syntax, such as:
>
> {{#ask: [[Category:A]] ![[Category:B]] ... /
> {{#ask: [[Category:A]] [[Category:!B]] ...
>
>
> But nothing seems to work.
>
>
> I can query for a simple combination of categories. If I wanted a list
> of pages that were in [[Category:A]] AND/OR [[Category:B]], I would
> just say:
>
> {{#ask: [[Category:A]] [[Category:B]] ... /
> {{#ask: [[Category:A||B]] ...
>
>
> http://test.referata.com/wiki/Tq
>
>
> It seems that if I created a property called 'has category', I could
> do what I wanted. Is there a special reason why categories are handled
> different from properties with regards to querying (specifically
> negating)? Or have I just made a mistake in my syntax / reading?
>
> I can't seem to find this mentioned in the manual or discussed in the
> mailing list.
>
>
> Thanks for any comments,
> Dan.
>
> ---
> ---
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> focus on
> what you do best, core application coding. Discover what's new with
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> Semediawiki-user@...
> https://lists.sourceforge.net/lists/listinfo/semediawiki-user

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[Philipp Zaltenbach]

Hi Dan,

negation of a condition, i.e. NOT [[Some Category or Property
Annotation]] is currently not possible in SMW.
But I think that Denny and Markus have this item on their to-do list;
but it is unsure when this issue will get done.
It is harder to implement than the not equal operator, which is
available for testing unequality of property values [1].

For realizing negation you need to use SPARQL within SMW at the moment.

Regards,
Philipp
[1] http://semantic-mediawiki.org/wiki/Help:Selecting_pages#Not_equal


Dan Bolser schrieb:

> I would like to query for all pages that have been assigned
> [[Category:A]] but not [[Category:B]]. I tried various 'obvious'
> syntax, such as:
>
> {{#ask: [[Category:A]] ![[Category:B]] ... /
> {{#ask: [[Category:A]] [[Category:!B]] ...
>
>
> But nothing seems to work.
>
>
> I can query for a simple combination of categories. If I wanted a list
> of pages that were in [[Category:A]] AND/OR [[Category:B]], I would
> just say:
>
> {{#ask: [[Category:A]] [[Category:B]] ... /
> {{#ask: [[Category:A||B]] ...
>
>
> http://test.referata.com/wiki/Tq
>
>
> It seems that if I created a property called 'has category', I could
> do what I wanted. Is there a special reason why categories are handled
> different from properties with regards to querying (specifically
> negating)? Or have I just made a mistake in my syntax / reading?
>
> I can't seem to find this mentioned in the manual or discussed in the
> mailing list.
>
>
> Thanks for any comments,
> Dan.
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Semediawiki-user mailing list
> Semediawiki-user@...
> https://lists.sourceforge.net/lists/listinfo/semediawiki-user
>  

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[Dan Bolser-3]

2009/11/5 Laurent Alquier <laurent@...>:
> It is not possible to query on properties that are not set - only on
> existing values.
>
> For complex operations on categorization, I found it is more convenient to
> keep only one category per page, as a master Type for that page , and use
> properties for more complex structures.

Right. The current prevailing data modelling style is one category per
page, making the query I described meaningless.

I just find it strange (or perhaps not...) that I can define a
property called 'has category' and use it to get exactly what I need.
In this case it would look something like this:

{{#ask: [[has category::A]] [[has category::!B]] ...


The reason I'm labouring this point is that it seems to be a common
request on the Wikipedia / MediaWiki discussion lists / feature
requests. Wikipedia seems to have more than one category per page on
occasion, so it would be quite nice if SMW 'fixed' this problem.


Thanks all for comments,
Dan.

> - Laurent Alquier
> Http://www.Alquier.org
>
>
> On Nov 5, 2009, at 11:11 AM, Dan Bolser <dan.bolser@...> wrote:
>
>> I would like to query for all pages that have been assigned
>> [[Category:A]] but not [[Category:B]]. I tried various 'obvious'
>> syntax, such as:
>>
>> {{#ask: [[Category:A]] ![[Category:B]] ... /
>> {{#ask: [[Category:A]] [[Category:!B]] ...
>>
>>
>> But nothing seems to work.
>>
>>
>> I can query for a simple combination of categories. If I wanted a list
>> of pages that were in [[Category:A]] AND/OR [[Category:B]], I would
>> just say:
>>
>> {{#ask: [[Category:A]] [[Category:B]] ... /
>> {{#ask: [[Category:A||B]] ...
>>
>>
>> http://test.referata.com/wiki/Tq
>>
>>
>> It seems that if I created a property called 'has category', I could
>> do what I wanted. Is there a special reason why categories are handled
>> different from properties with regards to querying (specifically
>> negating)? Or have I just made a mistake in my syntax / reading?
>>
>> I can't seem to find this mentioned in the manual or discussed in the
>> mailing list.
>>
>>
>> Thanks for any comments,
>> Dan.
>>
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day
>> trial. Simplify your report design, integration and deployment - and focus
>> on
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Semediawiki-user mailing list
>> Semediawiki-user@...
>> https://lists.sourceforge.net/lists/listinfo/semediawiki-user
>
>

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