[SerializableAttribute]
public abstract class BaseCollection<T> : IEnumerable<T>, 
	IEnumerable

<SerializableAttribute>
Public MustInherit Class BaseCollection(Of T)
	Implements IEnumerable(Of T), IEnumerable

[SerializableAttribute]
generic<typename T>
public ref class BaseCollection abstract : IEnumerable<T>, 
	IEnumerable

[<AbstractClassAttribute>]
[<SerializableAttribute>]
type BaseCollection<'T> =  
    class
        interface IEnumerable<'T>
        interface IEnumerable
    end