net.sf.saxon.s9api

Class XdmEmptySequence

public class XdmEmptySequence extends XdmValue

The class XdmEmptySequence represents an empty sequence in the XDM Data Model.

This is a singleton class: there is only one instance, which may be obtained using the XdmEmptySequence method.

An empty sequence may also be represented by an XdmValue whose length happens to be zero. Applications should therefore not test to see whether an object is an instance of this class in order to decide whether it is empty.

Note: in interfaces that expect an XdmItem, an empty sequence is represented by a Java null value.

Method Summary
static XdmEmptySequencegetInstance()
Return the singleton instance of this class
intsize()
Get the number of items in the sequence

Method Detail

getInstance

public static XdmEmptySequence getInstance()
Return the singleton instance of this class

Returns: an XdmValue representing an empty sequence

size

int size()
Get the number of items in the sequence

Returns: the number of items in the value - always zero