/// <summary>
/// { start : lowerbound-of-fhirdatetime, end : upperbound-of-fhirdatetime }
/// <seealso cref="ToExpressions(Period)"/>, with lower and upper bounds of FhirDateTime as bounds of the Period.
/// </summary>
/// <param name="element"></param>
/// <returns></returns>
private List <Expression> ToExpressions(FhirModel.FhirDateTime element)
{
if (element == null)
{
return(null);
}
var bounds = new List <IndexValue>();
bounds.Add(new IndexValue("start", new DateTimeValue(element.LowerBound())));
bounds.Add(new IndexValue("end", new DateTimeValue(element.UpperBound())));
return(ListOf(new CompositeValue(bounds)));
}
