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using Domain.Core;

public class OrderAggregate : AggregateRoot
{
    public IEnumerable<DomainEvent> PlaceOrder(
        CustomerId customerId, 
        IEnumerable<OrderItem> items)
    {
        // Domain business rules
        if (!items.Any())
            throw new EmptyOrderException();
            
        var order = Order.Create(customerId, items);
        return new[] { new OrderPlacedEvent(order.Id) };
    }
}