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        A type X meets the InternetProtocol requirements
        if it satisfies the requirements of AcceptableProtocol,
        as well as the additional requirements listed below.
      
        In the table below, a denotes a (possibly const) value of type
        X, and b denotes a (possibly const) value of type
        X.
      
Table 18. InternetProtocol requirements
| expression | return type | 
                  assertion/note | 
|---|---|---|
| 
                   | 
                   | The type of a resolver for the protocol. | 
| 
                   | 
                   | Returns an object representing the IP version 4 protocol. | 
| 
                   | 
                   | Returns an object representing the IP version 6 protocol. | 
| 
                   | 
                  convertible to  | 
                  Returns  | 
| 
                   | 
                  convertible to  | 
                  Returns  |