2.1.1178 Part 1 Section 19.5.78, subTnLst (Sub-TimeNodes List)

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a.   The standard states that the subTnLst element describes time nodes that have a start time which is not based on the containing timenode.

In PowerPoint, this element is only used when applied to nodes of depth 5 within the Slide Timing tree ("[ISO/IEC-29500-1] §19.3.1.48; timing").  The root element within the Time Node List ("[ISO/IEC-29500-1] §19.5.87; tnLst") shall be a par element and this subTnLst element shall only be used when contained within seq child element of this root element. 

The Target Element ("[ISO/IEC-29500-1] §19.5.81; tgtEl") contained within any anim, animClr, animEffect, animMotion, animRot, animScale, or set child element of subTnLst shall have either a Sound Target ("[ISO/IEC-29500-1] §19.5.70; sndTgt") or a Shape Target ("[ISO/IEC-29500-1] §19.5.72; spTgt") child element.

The Target Element ("[ISO/IEC-29500-1] §19.5.81; tgtEl") contained within an audio or video child element shall have either a Shape Target ("[ISO/IEC-29500-1] §19.5.72; spTgt") child element that references a valid media shape or a Sound Target ("[ISO/IEC-29500-1] §19.5.70; sndTgt") that references a valid sound target.

Any excl, par or seq child element shall have at least one cmd, anim, animClr, animEffect, animMotion, animRot, animScale, set, audio, or video child element. The first of these child elements shall have either a Sound Target ("[ISO/IEC-29500-1] §19.5.70; sndTgt") or a Shape Target ("[ISO/IEC-29500-1] §19.5.72; spTgt") child element.