OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide

GPI Object Management

OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide—424822-001

3-5

Objects and X.400 Messages

As shown, the message consists of envelope and content information. Inside the

gateway, this information is represented by a root object that has 14 attributes. Thirteen

of the attributes represent envelope information; the fourteenth represents content

information. As in Figure 3-2, each attribute that represents a subobject on the next

level is shown in boldface type. This object has seven such attributes.

The DDL name of the object and each of the attributes also is shown. The names are

based on XAPIA specifications. The MH-C- prefix indicates an object class name. The

MH-T- prefixes indicate names for attribute types. A complete listing of XAPIA classes

and the attribute types associated with them is in the GPI Reference Manual.

Figure 3-5 shows a different view of the root object. In this view, DDL names have

been modified to be more readable (prefixes and dashes have been deleted). Throughout

the remainder of this guide, this style is used for examples that show specific objects.

In this view, two of the subobjects on the second level of this root object are shown.

The class names of the subobjects are in all uppercase letters. Note that the class name

of the second subobject, External Trace Entry, is not the same as the name of the

attribute type that represents it, External Trace Info. This is true for many XAPIA

classes.

Figure 3-4. X.400 Message as Object

Note. For purposes of a simple example, a special OM-T-CLASS or “class” attribute is not

shown in this object or in the subobjects depicted in Figures 3-5 and 3-6. As described later,

all objects contain an instance of OM-T-CLASS. The purpose of the attribute is to identify the

object’s class name.

304CDT .CDD

Message

Content

MH-T-BILATERAL-INFORMATION

MH-T-EXTERNAL-TRACE-INFO

MH-T-ORIGINAL-EITS

MH-C-MESSAGE

MH-T-ORIGINATOR-NAME

MH-T-RECIPIENT-DESCRIPTORS

MH-T-PRIORITY

MH-T-CONTENT-IDENTIFIER

MH-T-MTS-IDENTIFIER

MH-T-CONTENT-TYPE

MH-T-DISCLOSURE-ALLOWED

MH-T-CONVERSION-PROHIBITED

MH-T-ALTERNATE-RECIP-ALLOWED

MH-T-CONTENT-RETURN-REQUESTED

MH-T-CONTENT

Message

Envelope