2.1.544 Part 1 Section 17.18.42, ST_HpsMeasure (Measurement in Half-Points)
a. The standard states that the contents of the ST_HpsMeasure simple type are a restriction on the XML Schema unsignedLong datatype.
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Word defines this simple type as being a restriction on the XML Schema unsignedInt datatype, with a minimum value of 2 and a maximum value of 3277.