FTAM/9000 Programmer's Guide

438 Chapter 11
Document Types and Constraint Sets
Document Types
• The string_significance parameter determines the exact significance
of the character strings. Three values are supported:
• FT_SS_NO_SIGNIFICANCE - the string or data element
boundaries are not preserved across file transfers. For example, if
you create a file using eight strings, you may or may not receive
eight strings back when you read the file. Different FTAM
implementations may break the file into strings in different ways.
• FT_SS_FIXED - the string boundaries are preserved across
transfers and each string is of the size specified in the maximum
string length parameter.
• FT_SS_VARIABLE - the string boundaries are preserved across
transfers and the length of each string is less than or equal to the
size specified in the maximum string length parameter.
INTAP-1 Document Type
INTAP-1 has only one FADU that contains zero, one, or more records.
Each record consists of octets of any value from 0 to 255. Figure 11-7
shows the INTAP-1 document type structure.
INTAP-1 uses the Unstructured constraint set to restrict the file model,
and therefore uses the Unstructured All (UA) access context. Refer to the
“Constraint Sets” and “Access Contexts” sections for detailed
information.
Refer to the “FTAM Data Structures” chapter for detailed information on
setting the INTAP-1 document type using the Ft_dt_intap_1 structure.
Figure 11-7 INTAP-1 Document Type Structure
unstructured
root node
data unit
record record record
** * ** *
* record-element (data element)