2.1.1194 Part 1 Section 19.7.43, ST_TLTimeNodeMasterRelation (Time Node Master Relation)

a.   The standard states that lastClick is a valid master relation value.

PowerPoint does not support this value.

b.   The standard places no restrictions on when the playback behavior applies.

PowerPoint only applies the playback behavior when the time node is contained within a subTnLst element.

c.   The standard does not specify how to interpret the sameClick master relation.

PowerPoint uses this value to signify that the time node will start at the same time as its master time node.

d.   The standard does not specify how to interpret the nextClick master relation.

PowerPoint uses this value to signify that the time node will start when the next time node group starts.