RFC 1487 (rfc1487) - Page 3 of 21

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RFC 1487                       X.500 LDAP                      July 1993


3.2.  Connection Oriented Transport Service (COTS)

   The connection is established.  No special special use of T-Connect
   is made.  Each LDAPMessage PDU is mapped directly onto T-Data.

4.  Elements of Protocol

   For the purposes of protocol exchanges, all protocol operations are
   encapsulated in a common envelope, the LDAPMessage, which is defined
   as follows:

     LDAPMessage ::=
         SEQUENCE {
              messageID      MessageID,
              protocolOp     CHOICE {
                                  bindRequest         BindRequest,
                                  bindResponse        BindResponse,
                                  unbindRequest       UnbindRequest
                                  searchRequest       SearchRequest,
                                  searchResponse      SearchResponse,
                                  modifyRequest       ModifyRequest,
                                  modifyResponse      ModifyResponse,
                                  addRequest          AddRequest,
                                  addResponse         AddResponse,
                                  delRequest          DelRequest,
                                  delResponse         DelResponse,
                                  modifyRDNRequest    ModifyRDNRequest,
                                  modifyRDNResponse   ModifyRDNResponse,
                                  compareDNRequest    CompareRequest,
                                  compareDNResponse   CompareResponse,
                                  abandonRequest      AbandonRequest
                             }
         }

     MessageID ::= INTEGER (0 .. MaxInt)

   The function of the LDAPMessage is to provide an envelope containing
   common fields required in all protocol exchanges. At this time the
   only common field is a message ID, which is required to have a value
   different from the values of any other requests outstanding in the
   LDAP session of which this message is a part.

   The message ID value must be echoed in all LDAPMessage envelopes
   encapsulting responses corresponding to the request contained in the
   LDAPMessage in which the message ID value was originally used.

   In addition to the LDAPMessage defined above, the following
   definitions are also used in defining protocol operations:



Yeong, Howes & Kille