show what is not in an specific category

[david-217]

Hi;

How can I make a query (using {{#ask:) to show the pages that aren't in
an specific category?

I want to show the pages in [[category:card]] but hidding the pages in
[[category:incomplete card]].

Thanks.

dvdgmz


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[S Page-2]

david wrote:

> How can I make a query (using {{#ask:) to show the pages that aren't in
> an specific category?
>
> I want to show the pages in [[category:card]] but hidding the pages in
> [[category:incomplete card]].

I don't think there's any way to do this.  As
http://semantic-mediawiki.org/wiki/Help:Selecting_pages says

"Comparators work only for property values, but not for conditions on
categories."

So you can't use the '!' NOT comparator to say [[category:!incomplete
card]] the same way you can say, e.g., [[date of birth::!1935-12-01]]



A couple of ideas:

* Set the inline query to display ?Category, use format=template to
print results, and if this template parameter contains "incomplete
card", don't print.

* You could have a boolean notIncompleteCard that tracks the category
assignment.  Code could set this to true or false based on category
values using a similar technique to "using an inline query to produce
inverse annotations" (see
http://semantic-mediawiki.org/wiki/California).  Then query for this
property.

Regards,
--
=S Page

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[張致信 Michael Chang]

Hi Daivd,
Please see http://www.mediawiki.org/wiki/Extension:CategoryTests for your reference.

2008/7/27 S Page <info@...>

david wrote:

> How can I make a query (using {{#ask:) to show the pages that aren't in
> an specific category?
>
> I want to show the pages in [[category:card]] but hidding the pages in
> [[category:incomplete card]].

I don't think there's any way to do this.  As
http://semantic-mediawiki.org/wiki/Help:Selecting_pages says

"Comparators work only for property values, but not for conditions on
categories."

So you can't use the '!' NOT comparator to say [[category:!incomplete
card]] the same way you can say, e.g., [[date of birth::!1935-12-01]]



A couple of ideas:

* Set the inline query to display ?Category, use format=template to
print results, and if this template parameter contains "incomplete
card", don't print.

* You could have a boolean notIncompleteCard that tracks the category
assignment.  Code could set this to true or false based on category
values using a similar technique to "using an inline query to produce
inverse annotations" (see
http://semantic-mediawiki.org/wiki/California).  Then query for this
property.

Regards,
--
=S Page

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[david-217]

Thanks a lot. I'll try these ways.
But...

El ds 26 de 07 del 2008 a les 22:53 -0700, en/na S Page va escriure:

> A couple of ideas:
>
> * Set the inline query to display ?Category, use format=template to
> print results, and if this template parameter contains "incomplete
> card", don't print.

How can I check if "parameter CONTAINS"?
With "parserFunctions" I can only check if is-equal (#ifeq) not
if-contains.
http://meta.wikimedia.org/wiki/Help:ParserFunctions#.23ifeq:

>
> * You could have a boolean notIncompleteCard that tracks the category
> assignment.  Code could set this to true or false based on category
> values using a similar technique to "using an inline query to produce
> inverse annotations" (see
> http://semantic-mediawiki.org/wiki/California).  Then query for this
> property.

Mmmmhh. I'll study it.
>



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[Markus Krötzsch-2]

As a further explanation: SMW currently has no way to ask for pages that do
*not* meet a certain criterion! Even the comparator ::! checks for the
*existence* of a value that is unequal to the given one, it does not check
for the absence of a value.

I know that negation would be useful to have. What would our syntax be? Maybe
just write "NOT" in a query (like "OR" now)?

On semanticweb.org, we use templates that check if something is not the case
(using parserfunctions) and then assign a category to such pages. Hence we
turn the absence of certain inputs into positive information by template
code. Somewhat hacky but doable.

-- Markus

On Sonntag, 27. Juli 2008, david wrote:

> Thanks a lot. I'll try these ways.
> But...
>
> El ds 26 de 07 del 2008 a les 22:53 -0700, en/na S Page va escriure:
> > A couple of ideas:
> >
> > * Set the inline query to display ?Category, use format=template to
> > print results, and if this template parameter contains "incomplete
> > card", don't print.
>
> How can I check if "parameter CONTAINS"?
> With "parserFunctions" I can only check if is-equal (#ifeq) not
> if-contains.
>
> http://meta.wikimedia.org/wiki/Help:ParserFunctions#.23ifeq:
> > * You could have a boolean notIncompleteCard that tracks the category
> > assignment.  Code could set this to true or false based on category
> > values using a similar technique to "using an inline query to produce
> > inverse annotations" (see
> > http://semantic-mediawiki.org/wiki/California).  Then query for this
> > property.
>
> Mmmmhh. I'll study it.
>
>
>
>
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--
Markus Krötzsch
Semantic MediaWiki    http://semantic-mediawiki.org
http://korrekt.org    markus@...


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[Friedel Völker (Stadtwiki)]

2008/8/5, Markus Krötzsch <markus@...>:
> As a further explanation: SMW currently has no way to ask for pages that do
>  *not* meet a certain criterion! Even the comparator ::! checks for the
>  *existence* of a value that is unequal to the given one, it does not check
>  for the absence of a value.
>
>  I know that negation would be useful to have. What would our syntax be? Maybe
>  just write "NOT" in a query (like "OR" now)?

Yes. I'd like to have "NOT" (as in SQL).

Friedel

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[david-217]

+1 vote for "NOT".

dvdgmz.

El dt 05 de 08 del 2008 a les 10:58 +0200, en/na Friedel Völker
(Stadtwiki) va escriure:

> 2008/8/5, Markus Krötzsch <markus@...>:
> > As a further explanation: SMW currently has no way to ask for pages that do
> >  *not* meet a certain criterion! Even the comparator ::! checks for the
> >  *existence* of a value that is unequal to the given one, it does not check
> >  for the absence of a value.
> >
> >  I know that negation would be useful to have. What would our syntax be? Maybe
> >  just write "NOT" in a query (like "OR" now)?
>
> Yes. I'd like to have "NOT" (as in SQL).
>
> Friedel
>
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> Build the coolest Linux based applications with Moblin SDK & win great prizes
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