5.3 Syntax Information

      declaration:
           type-specifier identifier
         | type-specifier identifier "[" value "]"
         | type-specifier identifier "<" [ value ] ">"
         | "opaque" identifier "[" value "]"
         | "opaque" identifier "<" [ value ] ">"
         | "string" identifier "<" [ value ] ">"
         | type-specifier "*" identifier
         | "void"

      value:
           constant
         | identifier

      type-specifier:
           [ "unsigned" ] "int"
         | [ "unsigned" ] "hyper"
         | "float"
         | "double"
         | "quadruple"
         | "bool"
         | enum-type-spec
         | struct-type-spec
         | union-type-spec
         | identifier

      enum-type-spec:
         "enum" enum-body

      enum-body:
         "{"
            ( identifier "=" value )
            ( "," identifier "=" value )*
         "}"

      struct-type-spec:
         "struct" struct-body

      struct-body:
         "{"
            ( declaration ";" )
            ( declaration ";" )*
         "}"

      union-type-spec:
         "union" union-body
      union-body:
         "switch" "(" declaration ")" "{"
            ( "case" value ":" declaration ";" )
            ( "case" value ":" declaration ";" )*
            [ "default" ":" declaration ";" ]
         "}"

      constant-def:
         "const" identifier "=" constant ";"

      type-def:
           "typedef" declaration ";"
         | "enum" identifier enum-body ";"
         | "struct" identifier struct-body ";"
         | "union" identifier union-body ";"

      definition:
           type-def
         | constant-def

      specification:
           definition *