List-based operators

A range of operators use a List or Set as their scope. They can work with either attribute type, retaining data type, and may use list-based group designators or find().

The group may be any designator from:

• any designator from {children,descendants,sibling,ancestor,all}
• a find()
• a list-based group designator

Such operators are:

• count(list)
• List/Set.count
• List/Set.intersect(set)
• List/Set.max
• List/set.min
• max(list)
• min(list)