RETELL ====== Syntax: (retell <simple-predication> old-value) ::= (retell [<relation-name> <instance> <new-value>] old-value) With RETELL it is possible to change the values of instances. The old instance value can be replaced by a new value. If the old value is unknown, it can be replaced by the anonymus variable _. RETELL returns T, if the knowledge base has been changed, otherwise NIL. Example: >(retell [options Siemens-Nixdorf 1,6GB-harddisk] 1GB-harddisk) T In this case the 1GB-harddisk of the Siemens- Nixdorf-computer will be replaced by a 1,6GB-harddisk!