Command_Parameters

element-expression

   Specifies one or more elements whose generations are to be
   inserted into the class. An element expression can be an element
   name, a group name, a wildcard expression, or a list of these
   separated by commas. By default, the most recent generation on the
   main line of descent is inserted.

class-expression

   Specifies an established class into which the element generation
   is being placed. The class must not have the read-only attribute.
   A class expression can be a class name, a wildcard expression, or
   a list of these separated by commas.

remark

   Specifies a character string to be logged in the history file
   with this command, usually used to explain why the command was
   entered. The remark is enclosed in quotation marks. If no remark
   was entered, a null remark ("") is logged.