OSI/AS Programming Manual

Parameter Structures
DDL Definitions
A–16 056783 Tandem Computers Incorporated
the presentation context definition result list; you must preserve the order of the
elements. For each element, you must set the following values in the presentation
context definition result list:
Set the result (ZRESULT) to either accept or reject the presentation context (ZAPS-
VAL-CNTXT-RSLT-ACCEPT or ZAPS-VAL-CNTXT-RSLT-U-REJECT).
If you choose to accept the presentation context, set the transfer syntax name (ZTS-
NAME) to one of the names proposed in the presentation context. If you reject the
presentation context, you need not set the transfer syntax name.
Set the reason (ZREASON) to the appropriate ZAPS-VAL-CNTXT-RSN-xxx value.
In a connect confirm: OSI/AS sets the presentation context definition result list for a
connect confirm exactly as it was set by the remote system.
ZAPS-DDL-PRES-DEFLT-CNTXT is the presentation default context name. It
contains the default presentation context (abstract syntax and transfer syntax) to be
used for data transfer if no presentation context definition list is given.
DEFINITION ZAPS-DDL-PRES-DEFLT-CNTXT.
02 ZDEFLT-CNTXT-ISPRESENT
TYPE ZAPS-DDL-ISPRESENT.
02 ZAS-NAME TYPE ZAPS-DDL-ABSTRACT-SYN-NAME.
02 ZTS-NAME TYPE ZAPS-DDL-TRANSFER-SYN-NAME.
END
ZAPS-DDL-PSAP defines a service access point address. It contains the OSI address
of an application process.
DEFINITION ZAPS-DDL-PSAP.
02 ZPSEL TYPE ZAPS-DDL-CHAR16.
02 ZSSEL TYPE ZAPS-DDL-CHAR16.
02 ZTSEL TYPE ZAPS-DDL-CHAR32.
02 ZNSAP TYPE ZAPS-DDL-CHAR20.
END
ZPSEL is the presentation selector address. This field is not used for session
connections.
ZSSEL is the session selector address.
ZTSEL is the transport selector address. It defines a user of the transport service.
ZNSAP is the network service access point. It is unique in an OSI network and is
defined by an authority of the network.