<(DEFMEMBER name type-expr [documentation
[alias]])>
Appearing inside a class definition between the DEFCLASS and ENDCLASS statements, this statement defines the member name (a LISP
symbol) having the data type type-expr (see type expressions at
page 
) for the current class. The optional documentation
string as well as the optional alias name symbol are recorded in the
current class of the class association list. C code is produced for the
structure component, and an appropriate documentation comment is
generated, if a documentation string was given. An alias macro is
appended after the class definition is finished, accessing the same structure
component, if an alias was requested.