Both item and group scoped designators are allowed in attribute references. For example:
$MyList=$Color(children);
finds a list of the colours ($Color) of each child of this note, and
$MyList=$Color(children).unique;
finds the same list but without duplicates. N.B. lists can hold duplicate values.
Working with numerical values:
$MyNumber=$Width(children).max;
will find the maximum width of the container's children.
When the same designator is applied to the attribute $Text
$Text=$Text(children);
the texts of each child are placed in this note's $Text, separated by paragraph breaks. To append the same child text to existing text:
$Text=$Text+"\n"+$Text(children);
See also—notes linking to here: