add support for "key is missing", for example by "!key" or "key not present"

[matkoniecz]

At least for me searching for cases where some key or keys are nor present is a typical task. Currently it is impossible to generate such queries with wizard and in addition syntax for achieving that is quite cumbersome.

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https://github.com/westnordost/StreetComplete is supporting first version in its internal equivalent of overpass-wizard

see for example https://github.com/westnordost/StreetComplete/blob/master/app/src/main/java/de/westnordost/streetcomplete/quests/recycling/AddRecyclingType.java#L21

where query is

nodes, ways, relations with amenity = recycling and !recycling_type"

!recycling type should be translated to

"recycling_type"!~".*"

[tyrasd]

isn't recycling_type != * (Matches objects that do not have a tag with the key.) what you're looking for? Example: http://overpass-turbo.eu/s/sar

[matkoniecz]

Yes, thanks and sorry for noise