2.1.1487 Part 1 Section 21.2.2.92, leaderLines (Leader Lines)

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

Office requires that the value of the val attribute of sibling element showLeaderLines is true when this element is specified.

b.   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.