FTAM/9000 Programmer's Guide

436 Chapter 11
Document Types and Constraint Sets
Document Types
• If the class parameter is not present, the default is
FT_CL_GRAPHIC_STRING. The character strings may contain
characters from any of the characters sets registered for use as G0,
G1, G2, or G3 sets, including SPACE.
1
Refer to the “Character Sets”
chapter for this list of characters.
• The string_length parameter determines the maximum number of
octets in each data element. HP–UX responders accept an unlimited
string_length. If the string_length parameter is not present, the
character strings are unbounded.
• The string_significance parameter determines the exact significance
of the character strings. Only the FT_SS_NO_SIGNIFICANCE value
is valid. The character string boundaries are not preserved when you
store the file and do not contribute to the document semantics.
FTAM-3 Document Type
FTAM-3 has only one FADU that contains zero or more binary octet
strings (Figure 11-5).
1. Registered in the International Register of Coded Characters Sets
for use with Escape Sequences
Figure 11-5 FTAM-3 Document Type Structure
FTAM-3 uses the Unstructured constraint set to restrict the file model,
and therefore uses the Unstructured All access context (Figure 11-6).
Refer to the “Constraint Sets” and “Access Contexts” sections for detailed
information.
FADU
DU
Octet String
Node
Descr.