@FunctionalInterface public interface MappingFunction
It maps an item of class F to a sequence of items of class T, returned as an iterator.
NOTE: Java allows a lambda expression to be used where an ItemMappingFunction
is needed, but C# does not (it's not possible in C# to have a class implementing
a delegate). So if a delegate is wanted, use
SequenceIterator map(Item item) throws XPathException
item- The item to be mapped.
XPathException- if a dynamic error occurs
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