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has Operator

18th May 2019 at 2:54pm
Common Operators Field Operators Filter Operators Negatable Operators
purposefilter the input by field existence
inputa selection of titles
suffixS = New in: 5.1.14 optionally, the keyword field or New in: 5.1.22 optionally, the keyword index
parameterF = the name of a field or, optionally an index
outputwithout suffix
» those input tiddlers in which field F has a non-empty value
suffix field
» those input tiddlers in which field F exists
! outputwithout suffix
» those input tiddlers in which field F does not exist or has an empty value
suffix field
» those input tiddlers in which field F does not exist
suffix index
» those input tiddlers in which index F does not exist