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Conformance and Interoperatility
OSI/FTAM Responder Manual—425199-001
2-4
Data-Transfer Considerations
Maximum-String-Length Parameter
Compaq FTAM supports unbounded strings. The limitations of the maximum-string-
length parameter are described in detail in Section 4.
String-Significance Parameter
The Compaq FTAM responder supports all three values (fixed, variable, and not-
significant) for the string-significance parameter in FTAM-1 documents. For the
FTAM-3 document type, it supports the values not-significant, fixed, and variable.
Universal-Class Parameter
The default universal-class parameter value used by the Compaq FTAM responder for
FTAM-1 and FTAM-2 files is GraphicString, as specified in ISO 8571.
Simplification and Relaxation
Simplification is the act of reading a file of a specific FTAM document type as a
less structured, or simpler, FTAM document type. Compaq FTAM supports
the simplification of FTAM-2 Enscribe relative files to FTAM-1 files, but does not
support simplification of Structured Query Language (SQL) tables.
Relaxation, or the process of deriving one document from another by making the
parameters describing it less restrictive, is not supported at all by Compaq FTAM.
Mapping of Contents-Type Parameters
The Compaq FTAM virtual filestore (VFS) supports the Compaq FTAM responder by
providing an interface to the Guardian file system. It maps FTAM file structures and
attributes to Guardian file structures and attributes, and vice versa. Section 4 describes
the mappings of FTAM document types to Guardian file types.
Note that the Compaq responder does not keep a permanent record of the contents-type
parameter values used on creation of a file in the VFS. These values are directly
available only during the life of the FTAM association in which the file was created.
When a remote initiator makes a create request followed by an open request and the
open request specifies a contents type of unknown, the responder uses the contents-type
parameter values specified in the create request. However, this information is lost when
the association is terminated. On subsequent accesses to the file via a select request
followed by an open request with a contents type of unknown, the responder uses its
default values based on the file structure, as described in Section 4.
Data-Transfer Considerations
This subsection briefly describes the aspects of Compaq FTAM data handling that might
affect interoperability between the Compaq FTAM responder and another FTAM
implementation. For complete information, see Section 4.