net.sf.saxon.expr
Interface MappingFunction
- MappingIterator.StatefulMappingFunction
- Atomizer.AtomizingFunction, TupleSorter.TupleUnwrapper
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.
map
public SequenceIterator map(Item item)
throws XPathException
Map one item to a sequence.
item
- The item to be mapped.
- 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.