2.1.1165 Part 1 Section 19.5.66, set (Set Time Node Behavior)
For additional notes that apply to this portion of the standard, please see the notes for tnLst, §19.5.87(b) .
a. The standard places no restrictions on the number of attrName child elements parented by the attrNameLst element when inside the set element.
PowerPoint requires that there be at least one attrName child element of the attrNameLst element when inside a set element; if more than one attrName child element exists, only the first will be used.