2.1.216 Part 1 Section 17.6.9, paperSrc (Paper Source Information)
a. The standard states that the first and other attributes can be any integer.
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Word restricts these values to the range of an unsigned short.
b. The standard simply states that this element's attributes specify "...a printer-specific code that uniquely identifies a specific printer tray..."
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Word passes this value to the Windows DEVMODE printing API [DEVMODE] where the value may have a standard meaning to Windows or an installed printer.