Package net.sf.saxon.expr
Interface MappingFunction
- All Known Implementing Classes:
ForExpression.MappingAction
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.
It maps an item of class F to a sequence of items of class T, returned as an iterator.
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Method Summary
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Method Details
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map
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.
- Throws:
XPathException
- if a dynamic error occurs
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