Class XdmEmptySequence

  • All Implemented Interfaces:

    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 Detail

      • getInstance

        public static XdmEmptySequence getInstance()
        Return the singleton instance of this class
        an XdmValue representing an empty sequence
      • size

        public int size()
        Get the number of items in the sequence
        size in class XdmValue
        the number of items in the value - always zero