/// <summary>
/// Annotate the specified <see cref="ElementDefinition"/> instance in the <see cref="StructureDefinition.Differential"/> component
/// with a reference to the associated <see cref="ElementDefinition"/> instance in the <see cref="StructureDefinition.Snapshot"/> component.
/// </summary>
/// <param name="diffElemDef"></param>
/// <param name="snapElemDef"></param>
internal static void SetSnapshotElementAnnotation(this ElementDefinition diffElemDef, ElementDefinition snapElemDef)
{
diffElemDef?.AddAnnotation(new SnapshotElementDefinitionAnnotation(snapElemDef));
}