net.sf.saxon.s9api
Class XdmEmptySequence
- Iterable
public class XdmEmptySequence
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.
getInstance
public static XdmEmptySequence getInstance()
Return the singleton instance of this class
- an XdmValue representing an empty sequence
int size
public @Override int size()
Get the number of items in the sequence
- the number of items in the value - always zero