CAN/CSA-ISO/IEC 10607-5-98 (R2002)

Information Technology - International Standardized Profiles AFTnn - File Transfer, Access and Management - Part 5: AFT22 - Positional File Access Service (Flat) (Adopted ISO/IEC 10607-5:1995)

Publication Year 1998
Published by CSA Group
Reaffirmed in 2002
Withdrawn

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Preface/Scope

Scope

1.1 General
This part of ISO/IEC ISP 10607 (AFT22) covers access to files between the filestores of two end systems, using the OSI connection-mode transport service to provide the interconnection. One end system acts in the initiator role and requests access to the file, the other end system acts in the responder role and provides access to the file in the virtual filestore.

These role combinations and the interoperability are shown in table 1.

Access of files is supported for files with an unstructured, flat or random access constraint set and containing binary or character data.

This part of ISO/IEC ISP 10607 specifies implementations that support file transfer and file access, i.e. the ability to

(a) read an FADU which is identified by node name, node number or by position (depending on constraint set and document type),
(b) write (replace and/or extend and/or insert, depending on constraint set and document type) to a file, and
(c) locate and erase within a file;

and optionally to

(a) create and delete a file, and
(b) read the attributes of a file.

Grouping of actions is not mandatory. Therefore, the above file actions can be performed separately and also, multiple file actions ca n be performed within a given regime.

This part of ISO/IEC ISP 10607 specifies how the OSI FTAM application standard shall be used to provide the functions defined above. It does not specify total system capability. In particular, a system may operate this profile and at the same time engage in other communications. The requirements placed on an implementation in this part of ISO/IEC ISP 10607 are solely those necessary for operation of the protocol specified.

This part of ISO/IEC ISP 10607 describes the actions and attributes of the virtual filestore, and the service provided by the file service provider to file service users, together with the necessary communications between the initiator and the responder.

1.2 Position within the taxonomy
This part of ISO/IEC ISP 10607 is identified in ISO/IEC TR 10000-2 as AFT22 - Positional File Access Service (flat).

It may be combined with any T-Profiles (see ISO/IEC TR 10000) specifying the OSI connection-mode transport service.

1.3 Scenario
The model used is one of two end systems establishing an association a nd accessing files in the responder's virtual filestore as shown in figure 1.

Specifications of this part of ISO/IEC ISP 10607 apply on the double lin es of figure 1. The mapping between the virtual filestore and the real filestore together with the local data management system is not defined in this part of ISO/IEC ISP 10607.

This part of ISO/IEC ISP 10607 defines the selection of specific virtual filestore options, file service options and file protocol options. The required functions from the supporting protocol stack of ACSE, presentation and session are specified in ISO/ IEC ISP 10607-1 (see also table 2).

The document types, constraint sets and syntaxes which are referenced in this part of ISO/IEC ISP 10607 are defined in ISO 8571-2 and in ISO/IEC ISP 10607-2.