XdmEmptySequence

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

All Implemented Interfaces:

java.lang.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

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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, documentOrder, getUnderlyingValue, isEmpty, itemAt, iterator, makeSequence, makeValue, matches, select, stream, subsequence, toString, where, wrap, wrap

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

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- 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