https://bugzilla.wikimedia.org/show_bug.cgi?id=31269

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             Bug #: 31269
           Summary: Query (ask) for pages where a property isn't set?
           Product: MediaWiki extensions
           Version: any
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Semantic MediaWiki
        AssignedTo: wikibugs-l@lists.wikimedia.org
        ReportedBy: dan.bol...@gmail.com
                CC: jeroen_ded...@yahoo.com, mar...@semantic-mediawiki.org
    Classification: Unclassified


It would be good if you could query for pages where a certain property has not
been set to any value.

For example:

I would like a query that will list the pages that have ended up with no value
set for these properties, so I can check whether a user has made a mistake or
if we really no longer need that resource. But I can't work out how to do it...

It would still be nice to have the equivalent to 'if !isset(x)' available to
avoid having to use a dummy NULL value.

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