ItemMappingFunction (saxon JavaDoc)

All Known Implementing Classes:

AtomicSequenceConverter.AtomicSequenceMappingFunction, AtomicSequenceConverter.ToStringMappingFunction, EmptyTextNodeRemover, ForExpression.MappingAction, IntegratedFunctionCall.ConfigurationCheckingFunction, ItemTypeCheckingFunction, KeyFn.SubtreeFilter, WherePopulated
```
public interface ItemMappingFunction<F extends Item<?>,T extends Item<?>>
```
ItemMappingFunction is an interface that must be satisfied by an object passed to a ItemMappingIterator. It represents an object which, given an Item, can return either another Item, or null.
The interface is generic, paramterized by F (from) the input item type, and T (to), the output item type

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  T mapItem(F item)
  Map one item to another item.

- Method Detail
  - mapItem
```
T mapItem(F item)
   throws XPathException
```
    Map one item to another item.
    
    Parameters:
    
    item - The input item to be mapped.
    
    Returns:
    
    either the output item, or null.
    
    Throws:
    
    XPathException - if a dynamic error occurs