net.sf.saxon.expr

Interface MappingFunction

public interface MappingFunction

MappingFunction is an interface that must be satisfied by an object passed to a MappingIterator. It represents an object which, given an Item, can return a SequenceIterator that delivers a sequence of zero or more Items.
Method Summary
SequenceIteratormap(Item item)
Map one item to a sequence.

Method Detail

map

public SequenceIterator map(Item item)
Map one item to a sequence.

Parameters: item The item to be mapped.

Returns: one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.