/// <exception cref="ArgumentNullException">
/// <paramref name="first"/> is null.-or-
/// <paramref name="second"/> is null.
/// </exception>
public AssociationRelation AddAssociationRelation(TypeBase first, TypeBase second)
{
AssociationRelation association = new AssociationRelation(first, second);
AddRelation(association);
return(association);
}
/// <exception cref="ArgumentNullException">
/// <paramref name="first"/> is null.-or-
/// <paramref name="second"/> is null.
/// </exception>
public AssociationRelation AddAggregationRelation(TypeBase first, TypeBase second)
{
AssociationRelation association = new AssociationRelation(first, second);
association.IsAggregation = true;
AddRelation(association);
return(association);
}