Purpose: XPathNodes are used together to build a tree. The tree is built from all of the XPath statements specified in the mapping metadata (mappings and policies). This tree is then navigated by the TreeObjectBuilder to perform marshal and unmarshal operations.
The XPaths "a/b" and "a/c" would result in a tree with the root "a" and two child nodes "b" and "c".
Responsibilities:
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