2.1.1537 Part 1 Section 188.8.131.52, splitPos (Split Position)
a. The standard does not state any interplay between sibling element splitType and the val attribute.
In Office, if splitType is equal to pos, the value of the val attribute shall be an integer in the range of 0 to 32000, inclusive. If splitType is equal to percent, the value shall be in the range of 0.0 to 100.0, inclusive.
b. The standard states that this element can be a child of any ofPieChart element.
Office requires that the ofPieChart parent contain a splitType element with a val attribute equal to percent, pos, or val when this element is specified.
c. The standard states that attribute val is of type xsd:double.
Office does not allow INF, -INF, and NaN as supported values.