2.1.1453 Part 4 Section 22.214.171.124, barChart (Bar Charts)
For additional notes that apply to this portion
of the standard, please see the notes for axId, §126.96.36.199(a); gapWidth, §188.8.131.52(a).
a. The standard states that the maxOccurs value
for the serLines child element is unbounded.
Office limits the occurrences of this element to 1.