difference between an XML "Fragment" and an XML "Document."

An XML fragment is an XML document with no single top-level root element. To put it simple it is a part
(fragment) of a well-formed xml document. (node) Where as a well-formed xml document must have only
one root element.

anchoring different from docking

Anchoring treats the component as having the absolute size and adjusts its location relative to the parent
form. Docking treats the component location as absolute and disregards the component size. So if a status
bar must always be at the bottom no matter what, use docking. If a button should be on the top right, but
change its position with the form being resized, use anchoring.