
id - the identical function

Calling sequence:
id(expr ...)
id()

Parameter:

expr   --  expression

Summary:

id is the identical function. id evaluates its arguments and returns them as an
expression sequence. id () returns an element of the domain DOM_NULL    .
id is a kernel function.

>>  a:= 2: id(a, b, 4+2);

     2, b, 6

>>  domtype(id());

     DOM_NULL

