List-based operators

A range of operators use a List or Set as their scope. From v5.6.0 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() (from v5.6.0)
• a list-based group designator (from v5.6.0)

Such operators are:

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

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