FTAM/9000 Programmer's Guide

Chapter 11 443
Document Types and Constraint Sets
Constraint Sets
• Special semantics of specific file access actions
• Allowable FADU identity forms for each of the file access actions
Access Contexts
Each constraint set contains a list of available access contexts which
allow you to further restrict the file structure view during read
operations. The Access Contexts are Unstructured All Data Units (UA)
and Flat All Data Units (FA).
For FTAM-1, FTAM-3, and INTAP-1, only the UA access context is
available. For FTAM-2, both UA and FA are available. If you use the UA
access context when transferring FTAM-2 files, the file simplifies to an
FTAM-1 file; the node descriptor information does not transfer.
NOTE Refer to the “FTAM Data Structures” chapter for detailed information on
setting access contexts using the Ft_access_context structure.
Unstructured All (UA) FT_UNSTRUCTURED_ALL_DATA_UNIT
S Only the data elements in the data unit
(from the addressed FADU) transfer.
Flat All (FA) FT_FLAT_ALL_DATA_UNITS Node
descriptor information and data elements
from the data unit (from the addressed
FADU) transfer in the order that they are
stored.