At some place in the XElement, you'll need the prefix defined. Here's how to do it by putting the vt xmlns at the top, by adding it as an XAttribute: New XAttribute(XNamespace. Xmlns + "vt", "http://schemas.openxmlformats.org/officeDocument2006/docPropsVTypes").
This page might point you in the right direction http://msdn.microsoft.com/en-us/library/bb387069.aspx.
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