Answer Posted / sivaramakrishna

XmlDocument and XPathDocument are based on different data
models.
XmlDocument is based on W3C XML DOM, which is object model
that
basically covers all XML syntax, including low level syntax
sugar such
as entities, CDATA sections, DTD, notations etc. That's
document-centric
model and it allows for full fidelity when loading/saving
XML documents.

XPathDocument is based on XPath 1.0 data model which is
read-only XML
Infoset-compatible data-centric object model that covers
only
semantically significant parts of XML, leaving out
insignificant syntax
details - no DTD, no entities, no CDATA, no adjacent text
nodes, only
significant data expressed as a tree with seven types of
nodes. Simple
and lightweight.

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