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## net.sf.saxon.s9api
Class XdmEmptySequence

    java.lang.Object
      net.sf.saxon.s9api.XdmValue
          net.sf.saxon.s9api.XdmEmptySequence

All Implemented Interfaces:
  Iterable<XdmItem>

    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 `getInstance()` 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 XdmEmptySequence` | `getInstance()` Return the singleton instance of this class
`int` | `size()` Get the number of items in the sequence

Methods inherited from class net.sf.saxon.s9api.XdmValue
`append, getUnderlyingValue, itemAt, iterator, setValue, wrap`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getInstance

    public static XdmEmptySequence getInstance()

  Return the singleton instance of this class

  Returns:
    an XdmValue representing an empty sequence

### size

    public int size()

  Get the number of items in the sequence

  Overrides:
    `size` in class `XdmValue`
  Returns:
    the number of items in the value - always zero

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