2.1.1549 Part 1 Section 21.2.2.183, showLeaderLines (Show Leader Lines)

a.   The standard states that this element can be a child of any dLbls element.

Office requires that the ancestor include doughnutChart, ofPieChart, pie3DChart, or pieChart when this element is specified.

b.   The standard states that this element can be a child of any dLbls element.

Office requires that the val attribute equals true on one or more of the showCatName, showSerName, showVal, or showPercent sibling elements when this element is specified.