This is an implementation of the Iterator interface. It will traverse the tree and find the Paragraph/Heading Node sequences.
Note: Once the XML Tree is parsed, then the Iterator will be a snap shot of that tree. That means even the tree is modified later, than the cached paragraph Node list will not be updated accordingly. For this reason and for performance reasons this Iterator does not support any operation methods such as insert, remove or replace. The main purpose of this Iterator is to be used with difference, not with merge.
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