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- Recommendation T.441
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- DOCUMENT TRANSFER AND MANIPULATION (DTAM) - OPERATIONAL STRUCTURE
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- CONTENTS
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- Scope
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- 1 Overview of operational concept
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- 2 Operational application profile rules
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- 3 Operational structures
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- 4 Operational reference model
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- 5 Operational profile information
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- 6 Operational data formats
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- Scope
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- This Recommendation has been established to cover the needs of videotex interworking. It will be further
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- developed to cover the needs of other telematic services.
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- The operational structure should be developed as a set of rules for an interface between telematic applications
- based on T.400 Series of Recommendations and an ODA-document.
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- Fascicle VII.7 - Rec. T.441 1
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- 1 Overview of operational concept
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- A document is defined in terms of logical and/or layout structure according to the specifica- tions of the T.410
- Series of Recommendations.
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- The basic principle of the operational concept is to provide the means for the integration of telematic services
- requirements, not covered by the T.410 Series of Recommendations within the applications on the top of DTAM (see Figure
- 1/T.441).
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- FIGURE 1/T.441
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- Overview of DTAM (including operational structure)
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- Document handling, e.g. access to parts of a document and manipulation of a document requires detailed
- considerations; two aspects of document handling shall be distinguished:
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- a) In addition to the document, structural concepts need to be defined in T.400 Series of Recommendations;
- these concepts shall define the structural aspect of the document handling (as for example "forms for data
- entry").
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- Note - The definition of structural concepts is not in the scope of this Recommenda- tion. Specifications
- concerning such concepts require further detailed study.
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- b) In addition to the document, applications may require operational features which provide information for the
- interface between the document and the application. Interfaces are for example necessary for "Data Entry",
- "Spread Sheet", "Remote Editing", etc.
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- As an application on top of DTAM shall solely use DTAM service and protocol, this Recommendation provides the
- operational concept which allows to integrate operational features within the concept of DTAM.
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- The operational structure is introduced as a set of rules to structure the interface between a document and the
- application (see Figure 2/T.441). By defining a mapping onto the operational structure, the application integrates its
- operational features within DTAM. The mapping has to be specified within the appropriate Recommendation for the relevant
- application. The semantic of the interface is generally determined by the relevant application.
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- 2 Fascicle VII.7 - Rec. T.441
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- FIGURE 2/T.441
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- Operational structures provide the information for a structured
- interface between the document and the application
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- 2 Operational application profile rules
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- 2.1 General principles
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- This section specifies how operational application profiles can be implemented by using this Recommendation.
- Application defined usage of T.400 Series of Recommendations is specified in terms of application profiles. An application
- profile consists of a combination of:
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- - document application profiles according to the rules defined in T.411;
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- - communication application profiles according to the rules defined in T.431;
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- - operational structure application profiles according to the rules which will be defined in this
- Recommendation.
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- 3 Operational structures
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- This section describes the operational concept which is the basis for remote operation on a document. It facilitates
- access and manipulation to parts of a document through operations defined in T.430 Series of Recommendations.
- The concept can be used to associate application defined attributes and content with constituents of documents.
- For example, it may be used to specify fields for data entry and actions on the content of these fields. In this example, the
- semantics for data entry and actions may be expressed by the application.
- The operational structure follows in general the structuring principles typical of the document architecture as
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- described in T.412.
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- The constituents of the operational structure reference the document constituents they are operating on.
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- Multiple operational structures may be defined referring to a single document class.
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- Fascicle VII.7 - Rec. T.441 3
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- 4 Operational reference model
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- This section describes the common understanding of operations on:
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- - the document as a whole;
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- - parts of document.
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- This section provides a narrative description of these operations.
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- At present two types of operations will be defined:
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- - partial document transfer;
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- - remote document update.
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- Any complete set of operations on a document using the operational structure should result in a document
- conforming to the rules of the T.410 Series of Recommendations.
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- 5 Operational profile information
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- An operational structure profile includes information concerning:
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- - the reference to a document or a document class;
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- - application dependent references;
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- - operational structure level;
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- - the type of the content.
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- 6 Operational data formats
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- This section describes the format of the datastream used to interchange operational structures.
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- The operational structure can be interchanged as a whole or in parts.
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- The datastream is described in terms of a set of operational interchange data units which represent the
- constituents (e.g. operational profile, object class descriptors, object descriptors, and content) of an operational structure.
- The formats of the interchanged data units are defined using the abstract syntax notation one (ASN.1).
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- 4 Fascicle VII.7 - Rec. T.441
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