3.8.2 Interface Inheritance Specification

   The syntax for inheritance is as follows:

   (10)<interface_inheritance_spec>::=“:? <interface_name> { “,? <interface_name> }*

(11) <interface_name> ::= <scoped_name>

(12) <scoped_name> ::= <identifier> | “::? <identifier> | <scoped_name> “::? <identifier>

   Each <scoped_name> in an <interface_inheritance_spec> must denote a previously defined interface. See Section 3.8.5, “Interface Inheritance,? on page 3-23 for the description of inheritance.