net.sf.saxon.expr

Interface ContextMappingFunction

All Known Implementing Classes:

AnalyzeMappingFunction, ForEach, ForEachGroup, MergeInstr.MergeKeyMappingFunction

public interface ContextMappingFunction

ContextMappingFunction is an interface that must be satisfied by an object passed to a ContextMappingIterator. It represents an object which, given an Item, can return a SequenceIterator that delivers a sequence of zero or more Items.

This is a specialization of the more general MappingFunction class: it differs in that each item being processed becomes the context item while it is being processed.

Method Summary

Modifier and Type	Method and Description
SequenceIterator	map(XPathContext context) Map one item to a sequence.

Method Detail

map

SequenceIterator map(XPathContext context)
              throws XPathException

Map one item to a sequence.

Parameters:

context - The processing context. The item to be mapped is the context item identified from this context: the values of position() and last() also relate to the set of items being mapped

Returns:

a SequenceIterator over the sequence of items that the supplied input item maps to

Throws:

XPathException - if a dynamic error is detected