You sometimes need to specify a reference to a note relative to something else, like the current note. Group designators are a set of generic relative references to, or placeholders for, a group [sic] of notes whose actual identity is context sensitive. Group designators are written with lower case starting letters and inter-capitalised if multiword; e.g. sibling. Usage is case sensitive.
Unlike item designators, group designators may not be use for specifying attribute path references.
Thus, for a word count of the current note's children you use:
In older versions this would have required using an export code:
If a group is empty - e.g. the current note has no children, the group operator returns the equivalent value/boolean for the current note instead.
It is perfectly valid for a group designator to return a single item, if only one item meets the criteria of the designator. A container with only one child note with return list containing only item reference for its 'children'. Conversely, (single) item-scope designators must return a single item reference.