Class Aggregate

  • All Implemented Interfaces:
    java.io.Serializable, javax.xml.transform.SourceLocator, LocationProvider, SaxonLocator, InstructionInfo, org.xml.sax.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:
    Serialized Form