The specification states: "Each activity must have one and only one objective that contributes to rollup". The following type describes an unbounded set of elements all named "objective" that do not contribute to rollup, and one element called "primaryObjective" that contributes to rollup. Contributes to rollup of the activity. Does not contribute to the rollup of the activity. The type that describes an individual objective mapping. Mapping one local objective GUID to one global objective GUID