typedef [ [type_attribute, ...] ] type_specifier type_declarator, ...;

The type declaration defines a type used by an interface.

type_attribute

Specify the attributes of the type to be declared. The following attributes can be specified:

• string
  Character string
  
• ptr
  Complete pointer
  
• ref
  Reference pointer
  

type_specifier

Specify a data type. The basic type, configuration type (structure only), or any predefined type can be specified.

type_declarator

Specify the declarator of the type to be defined. The following can be specified:

• Simple declarator
• Fixed-length one-dimensional array
• Pointer

1. The string attribute can be specified in char and byte arrays only.
2. The ptr and ref attributes can be specified only for pointers to the basic type and structure type.

• union and enum cannot be used as the configuration type.
• A pointer to a function or array cannot be specified as a declarator.
• Adjustable and variable-length arrays cannot be used.
• Multi-dimensional arrays cannot be used.
• The following type attributes cannot be used:
  transmit_as, handle, context_handle, vl_struct, vl_array, vl_string, and vl_enum
  
• Only one pointer can be specified.
• No pointer can be specified for a structure member.
• The structure cannot be specified as a structure member.
• If the string attribute is specified, it is simply ignored without causing an error.