A MultiRule is a compound scheduling rule that represents a fixed group of child scheduling rules. A MultiRule conflicts with another rule if any of its children conflict with that rule. More formally, a compound rule represents a logical intersection of its child rules with respect to the
isConflicting equivalence relation.
A MultiRule will never contain other MultiRules as children. If a MultiRule is provided as a child, its children will be added instead.
This class is not intended to be subclassed by clients.
@since 3.0