purpose | filter the input by field existence |
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input | a selection of titles |
suffix | S = New in: 5.1.14 optionally, the keyword field or New in: 5.1.22 optionally, the keyword index |
parameter | F = the name of a field or, optionally an index |
output | without suffix » those input tiddlers in which field F has a non-empty valuesuffix field » those input tiddlers in which field F existssuffix index » those input data tiddlers in which index F exists |
! output | without suffix » those input tiddlers in which field F does not exist or has an empty valuesuffix field » those input tiddlers in which field F does not existsuffix index » those input data tiddlers in which index F does not exist |