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Each profile-specific Additional Field is optionally sent in a
single element named after the field, with the XML namespace prefix
u. The value of the field is the content of the XML element.
Note that the u XML namespace prefix should be declared in the
root <ThunderstoneReplication> node, as shown earlier.
For example, an Integer field Quantity and a
Text field State may be given as:
<u:Quantity>57</u:Quantity>
<u:State>NY</u:State>