Semantic MediaWiki

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

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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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.
>

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.
>
>
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge Build the coolest Linux based applications with Moblin SDK & win
> great prizes Grand prize is a trip for two to an Open Source event anywhere
> in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Semediawiki-user mailing list
> Semediawiki-user@...
> https://lists.sourceforge.net/lists/listinfo/semediawiki-user



-- 
Markus Krötzsch
Semantic MediaWiki    http://semantic-mediawiki.org
http://korrekt.org    markus@...

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

+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
> 
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Semediawiki-user mailing list
> Semediawiki-user@...
> https://lists.sourceforge.net/lists/listinfo/semediawiki-user