FND allows you to operate on a property of a selected set. The format is
FND '(' setexpression ',' setsize ')'
This attribute of selection finds a set, then compares the size with the setsize
parameter. If the set meets the size condition, the set is returned, otherwise a null set
is returned.
The function can be used to control the inclusion of subsets, and would normally be used
with the IF() or FOR()
functions.
FND(Attributes Node, > 5)
The function takes the current value of node, finds the set of attributes of node, and if the size of that set is greater than 5, returns the set, otherwise returns the null set.
If you are matching to a null set (using "= 0"), then the returned set is not null.