|`[is[missing]]` |Returns an empty list (see note below) |
Note that the ''is'' filter operator strictly filters the current list by choosing whether or not to include each one in the output. It never adds tiddlers to the results that are not already listed. This means that when used at the start of a run of filter operators the ''is'' operator will be choosing from the currently existing tiddlers, and so will never return missing tiddlers, or shadow tiddlers that haven't been overridden.