public virtual int this[
	int docID
] { get; set; }

public virtual int this[
	int docID
] { get; set; }

Public Overridable Default Property Item ( 
	docID As Integer
) As Integer
	Get
	Set

Public Overridable Default Property Item ( 
	docID As Integer
) As Integer
	Get
	Set

public:
virtual property int default[int docID] {
	int get (int docID);
	void set (int docID, int value);
}

public:
virtual property int default[int docID] {
	int get (int docID);
	void set (int docID, int value);
}

abstract Item : int with get, set
override Item : int with get, set

abstract Item : int with get, set
override Item : int with get, set