Version of the book that appears in your printed output. In the published Word document, this value is stored in the Tags field of the document's Properties window, and is used in the title page.
Note: This is not the same as the Object Version. The Document Version is just text that appears in your document. It does not identify the Book object, and it is not related to the Object Version in any way.
The PrintVersion element corresponds to the Version field on the Print tab of the Book object.