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OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide

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EDI Concepts
OSI/MHS Gateway Programmatic Interface (GPI) Programming Guide—424822-001
D-6
EDI Extensions
EDI Extensions
As mentioned in Section 4, Planning Your Program, extensions are a means by which
the CCITT adds new service elements to existing recommendations. Extensions allow
an existing application to detect protocol changes within a message and to know whether
an understanding of those changes is critical for processing the message. Within
Recommendation X.435, the CCITT provides a mechanism for EDI extensions.
An application structured to handle EDI extensions can more easily accommodate new
protocol features. The X.435 extensions mechanism is fully described and contrasted
with a similar X.400 mechanism in Using Extensions and Criticality
on page 4-5.
Figure D-4. Forwarding an EDIM
908CDT .CDD
EDI-C-EDIM-BODYPART
EDI-C-EDI-HEADING
Heading
Primary Body Part
Add'l Body Part n
Add'l Body Part n+1
EDIM (EDI-C-EDIM)
EDI-C-EDIM-EX-DF-BODYPART
EDI-C-EDIM-EX-DF-BODYPART
Heading
Primary Body Part
Add'l Body Part n
Add'l Body Part n+1
EDIM (EDI-C-EDIM)
Forwarded EDIM Forwarding EDIM