Class Aggregate

All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, InstructionInfo, Locator
Direct Known Subclasses:
Average, Count, Empty, Exists, Sum

public abstract class Aggregate extends SystemFunction
This abstract class provides functionality common to the sum(), avg(), count(), exists(), and empty() functions. These all take a sequence as input and produce a singleton as output; and they are all independent of the ordering of the items in the input.
See Also: