2.1.241 Part 1 Section 18.104.22.168, uiPriority (Optional User Interface Sorting Order)
a. The standard states that the values of the val attribute are defined by the XML Schema integer datatype.
Word restricts the value of this attribute to be at least 0 and at most 99.
b. The standard says the default behavior is to sort to the end of the list.
In Word, the default behavior is to sort to the beginning of the list.