Interface that is implemented by any classes that want to expose a method
that can be called in any scope in a template that returns values dependant on
the state of the iterator of the current scope.
SSViewer_BasicIteratorSupport is an example of this. See also
Called by SSViewer to get a list of iterator variables to expose to the
template, the instance method to call on an instance of this class to get the
value for those variables, and the class to use for casting the returned value
for use in a template
iteratorProperties( integer $pos, integer $totalItems )
Set the current iterator properties - where we are on the iterator.
Magic methods summary
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