nsIOutputIterator Interface

 Put |anElementToPut| into the underlying container or sequence at the position currently pointed to by this iterator.
 The iterator and the underlying container or sequence cooperate to |Release()|
 the replaced element, if any and if necessary, and to |AddRef()| the new element.

 The result is undefined if this iterator currently points outside the
 useful range of the underlying container or sequence.

 @param anElementToPut the element to place into the underlying container or sequence

void putElement(in nsISupports anElementToPut)

 Advance this iterator to the next position in the underlying container or sequence.

void stepForward()