private void AddToExisting(string elementName, ElementMappingValueEvaluated mapping)
{
var dict = GuardExistingValueList(elementName);
var key = mapping.Source ?? CrosswalkScopeBin.NullKey;
dict[key] = mapping.Translation;
}
/// <summary>
/// Called when [value evaluated].
/// </summary>
/// <param name="elementMappingValueEvaluated">The element mapping value evaluated.</param>
protected virtual void OnValueEvaluated(ElementMappingValueEvaluated elementMappingValueEvaluated)
{
ValueEvaluated(this, new ExtendedEventArgs <ElementMappingValueEvaluated>(elementMappingValueEvaluated));
}
