The NormalisedEventIterator class
Several of the NormalisedEvent methods return an instance of the NormalisedEventIterator class, which provides a way to step though the name-value pairs making up the normalised event, forwards or backwards.
The following public methods are provided:
 valid
valid - Check whether the iterator points to a valid element of the normalised event. Typically used as part of the loop condition when iterating over the contents of an event.
 key
key - Return the key (name) associated with the current event element pointed to by the iterator.
 value
value - Return the value associated with the current event element pointed to by the iterator.
 next
next - Move the iterator to the next element of the underlying normalised event instance. The iterator must be in a valid state (such that the 
valid function would return 
true) before this function is called. Note that the order in which elements is returned is not necessarily the same as the order in which they were added. The order may change as elements are added to or removed from the underlying event.
 back
back - Move the iterator to the previous element of the underlying normalised event instance. The iterator must be in a valid state (such that the 
valid function would return 
true) before this function is called. Note that the order in which elements is returned is not necessarily the same as the order in which they were added. The order may change as elements are added to or removed from the underlying event.
There is no public constructor; iterators are created and returned only by NormalisedEvent methods.
Please see the Javadoc documentationfor full information about the classes introduced in this section.
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