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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