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 Details

    • 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