op-neg-output: ''without suffix'' or with ''suffix `value`''<br>» those input tiddlers in which field <<.place F>> does <<.em not>> exist or has an empty value<br>''suffix `field`''<br>» those input tiddlers in which field <<.place F>> exists
op-output: ''without suffix'' or with ''suffix `value`''<br>» those input tiddlers in which field <<.place F>> has a non-empty value<br>''suffix `field`''<br>» those input tiddlers in which field <<.place F>> does <<.em not>> exist