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1、INTERNATIONAL STANDARDIZED PROFILE ISOJIEC ISP 11185-5 First edition 1994-l O-01 Information technology - International Standardized Profiles FVTZnn - Virtual Terminal Basic Class - Register of control object type definitions - Part 5: FvT218 - Logical Image Control Object Technologies de Iinforma t
2、ion - Profils normalis - European Workshop for Open Systems (EWOS); - Open Systems Environment Implementors Workshop (OIW) This International Standardized Profile ISO/IEC ISP 11185 forms an International Register of information objects in accordance with the procedures for the operation of OSI Regis
3、tration Authorities laid down in ISO/IEC 9834. It is issued in parts, with additional parts being issued as further entries are added to the register. Each part is prepared in accordance with an approval and maintenance process laid down by the Special Group on Functional Standardization of ISO/IEC
4、JTCl, information technology. ISO/IEC ISP 11185 is issued under the general title information technology - International Standardized Profiles FV72nn - Virtual Terminal Basic Class - Register of control object type definitions. At present the following parts are published or are in the course of pre
5、paration: - Part 1: MZl?, M212 - Sequenced and Unsequenced Application Control Objects - Part 2: M213, M214 - Sequenced and Unsequenced Terminal Control Objects - Part 3: M215, M216 - Application RIO Record Loading Control Object, Terminal RIO Record Notification Control Object - Part 4: M217 - Hori
6、zontal Tabulation Control Object - Part 5: M218 - Logical Image Control Object - Part 6: M219 - Status Message Control Object - Part 7: M21 IO - Entry-Control Control Object - Part 8: M221 - Forms FE/CO (Field Entry Instruction Control Object) No.1 - Part 9: M222 - Paged FE/CO (Field Entry Instructi
7、on Control Object) No.1 - Part 10: M231 - Forms FEPCO (Field Entry Pilot Control Object) No.1 - Part 11: M232 - Paged FEPCO (Field Entry Pilot Control Object) No. 1 - Part 12: M2116, M2117, NT21 18, NT21 19 - Generalized Telnet Synch, Signal, Negotiation and Subnegotiation Control Objects - Part 13:
8、 M2111 - Waiting Time Control Object - Part 14: M2112 - Printer Control Object - Part 15: M2113 - Field Definition Management Control Object - Part 16: M2114 - Terminal Signal Titles Control Object - Part 17: M2115 - Help Text Control Object Annex A of this part of ISO/IEC ISP 11185 forms an integra
9、l part of this International Standardized Profile. . . . III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:05:28 MDTNo reproduction or networking permitted without license from IHS
10、-,-,- ISO/IEC ISP 11185-5: 1994(E) Introduction This International Standardized Profile ISO/IEC ISP 11185 is defined within the context of Functional Standardization, in accordance with the principles specified in ISO/IEC TR 10000, “Framework and Taxonomy of International Standardized Profiles”. The
11、 context of Functional Standardization is one part of the overall field of Information Technology (IT) standardization activities, covering base standards, profiles and registration mechanisms. The Open Systems Interconnection (OSI) Standard IS0 9040 for the Virtual Terminal Basic Class Service iden
12、tifies a requirement for an International Register of VT Control Object type definitions. Procedures for the operation of this International Register are laid down in ISO/IEC 9834-5. This International Standardized Profile provides this register. The individual entries in this register constitute In
13、terchange Format and Representation Profiles (F-Profiles) within the framework of ISO/IEC TR 10000. This part of ISO/IEC ISP 11185 was developed in close cooperation between the three Regional OSI Workshops, namely the OSE Implementors Workshop (OIW) of the United States, the European Workshop for O
14、pen Systems (EWOS) and the OSI Asia- Oceania Workshop (AOW). It was developed under the editorship of EWOS from a control object specification contained in the European S-mode Forms Functional Standard of ENV 41 208. The text is harmonized between these three Workshops and it has been ratified by th
15、e plenary assemblies of each Workshop. 0 ISO/IEC Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:05:28 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERN
16、ATIONAL STANDARDIZED PROFILE SO/EC ISO/IEC ISP 11185-5: 1994(E) Information technology - International Standardized Profiles FVT2nn - Virtual Terminal Basic Class - Register of control object type definitions - Part 5: FVT218 - Logical Image Control Object 1 Scope 1.1 General The concept of Profiles
17、 for OSI, and the structure of the International Standardized Profiles that document them, are defined in ISO/IEC TR 10000-l. Such Profiles are divided into a number of different classes and sub-classes. Two of these classes contain sub-classes comprising functions of the Virtual Terminal Basic Clas
18、s Service and Protocol specified in the base standards IS0 9040 and IS0 9041. These are the Application Profiles (A-Profiles) and the Interchange Format and Representation Profiles (F-Profiles). The relationship between A-Profiles and F-Profiles is described in 7.3.2 of ISO/IEC TR 10000-l and is as
19、follows. Application Layer base standards require, implicitly or explicitly, the structure of information carried or referenced by them to be specified for each instance of communication. It is the purpose of F-Profiles to specify such information structures. Particular functional requirements may t
20、hen be met by the combination of an A-Profile with one or more F- Profiles. Establishment of a VT-association involves the selection by negotiation of a particular Virtual Terminal Environment profile (VTE-profile), and of particular values for any arguments of that VTE-profile. The VTE-profile spec
21、ification, and possibly also the values of certain VTE-profile arguments, may in turn reference the definitions of VT control object types and assignment types. These VTE-profiles, control object types and assignment types are thus information structures that require explicit reference within the VT
22、 protocol. Particular instances of these structures are fully defined within the base standards, but the base standards also provide for further instances to be defined by registration. Each registered instance constitutes an F-Profile within the framework of ISO/IEC TR 10000. The Virtual Terminal B
23、asic Class Service and Protocol may be used to realise a wide range of distinct functions. Particular functions may be realised through the selection of appropriate VT functional units, F-Profiles and other VTE- profile argument values. The specification of the selection required to realise a partic
24、ular function and to promote interoperability constitutes a Virtual Terminal A-Profile within the framework of lSO/lEC TR 10000. The three International Registers of VT information structures and the specifications of VT Application Profiles are each published as a separate multi-part ISP as follows
25、: - lSO/lEC ISP 11184 is the Register of VTE-profiles; - ISO/IEC ISP 11185 is the Register of control object type definitions; - ISO/IEC ISP 11186 is the Register of assignment-type definitions; - ISO/IEC ISP 11187 contains the specifications of VT Application Profiles. This part of ISO/IEC ISP 1118
26、5 contains the definition of a control object type that may be used to affect the manner in which y-arrays within the current update-window are represented in their image on a real device. The x-arrays with y-coordinate below some particular value are considered as moved from the top of the y-array
27、to the bottom. The particular value is set by a data element of such a CO. This control permits the display object to be scrolled vertically through a form, or a text file, without the need to rewrite the entire display object at each movement of its position within the form or file. 1.2 Position wi
28、thin the taxonomy The taxonomy of International Standardized Profiles for OSI is laid down in ISO/IEC TR 10000-2. Within the classification scheme of this taxonomy, the OSI Profiles specified in this International Standardized Profile are in the Virtual Terminal Registered Object sub-class of the cl
29、ass of Interchange Format and Representation Profiles. A Profile within this subclass has a Profile identifier of the form FVTabc, where abc is a structured numerical identifier that identifies the position of the Profile within each of the three levels of subdivision of the subclass. The values of
30、a and b are single digits but c is an integer that is not necessarily a single digit. In principle the IS0 Virtual Terminal model allows for multiple classes of operation, although at the time of publication of this International Standardized Profile only the Basic Class has been defined. The value
31、of the identifier component a 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:05:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC ISP 11185-5: 19
32、94(E) 0 ISO/IEC distinguishes between distinct types of information object as follows: - a = 1 for Basic Class VTE-profiles; - a = 2 for Basic Class Control Objects; - a = 3 for Basic Class Assignment Types. Control objects (COs) form one of the types of information object that may be present in the
33、 CCA. This is illustrated in figure 1, in which CO-I, CO-2, CO-n represent a number of different control objects present in the CCA. The negotiation during establishment of a VT-association will determine whether or not these will include a control object of the type whose specification is given in
34、this part of ISO/IEC ISP 11185. Values of a greater than 3 are reserved for future developments. This International Standardized Profile ISO/IEC ISP 11185 contains the specifications of the Profiles with identifiers of the form FVT2bc. For this form of identifier, the component b distinguishes betwe
35、en the five major classifications of Basic Class Control Objects as follows: - b = 1 for Miscellaneous Control Objects; - b = 2 for Field Entry Instruction Control Objects; - b = 3 for Field Entry Pilot Control Objects; - b = 4 for Reference Information Objects; - b = 5 for Termination Conditions Co
36、ntrol Objects. Each of these classifications corresponds to a sub-register under the procedures of ISO/IEC 9834-5. The identifier component c is the serial number of the control object type in the appropriate sub-register. Values of b greater than 5 are reserved for new classifications of Basic Clas
37、s Control Objects that may be defined in future amendments to IS0 9040. This part of ISO/IEC ISP 11185 contains the definition of the Miscellaneous Control Object type with the Profile identifier FVT218 - Logical Image Control Object. 1.3 Scenario The specification of the Virtual Terminal Service is
38、 given in IS0 9040. It is based on a model in which two VT-users communicate by means of a shared Conceptual Communication Area (CCA) that is a conceptual part of the VT service-provider. Information exchange is modelled by one VT-user updating the content of the CCA and the changed state of the CCA
39、 then being made accessible to the peer VT-user. The CCA is structured by the Virtual Terminal Service into a number of components. For a control object the Data Structure Definition (DSD) component of the CCA contains the syntax of its information content, including the range of possible values and
40、 the permitted update operations. The current value of its information content is contained in the Control, Signal and Status store (CSS) component. Updates to the current value take place through the issue of VT service primitives by one VT-user to the service-provider. Changes of state of the CCA
41、are made accessible through the issue of VT service primitives by the service-provider to the peer VT-user. By clause 14 of IS0 9040, COs enable VT-users to handle control information related to virtual terminal functions and to real devices. This control is exercised by the VT-users through semanti
42、cs associated with the information content and with the update operations of the CO. Definition of the semantics, or specification of the source of the semantics if the semantic details are not fully prescribed, forms part of the registered definition of the CO. These semantics are not however of co
43、ncern to the VT service-provider itself. The DSD will contain an ASN.l object identifier that identifies the registered definition, but the VT service-provider merely acts as a repository of this value. It is only the VT-user that requires knowledge of the registered definition. NOTE 1 - The VTE-par
44、ameter values that determine the syntax of the information content may not be negotiated explicitly during association establishment. Moreover, in the case of non-parametric COs these values do not determine the details of the syntax. Such values and details form part of the registered definition of
45、 the CO. Since the VT service-provider is not required to have knowledge of this registered definition, in principle the VT-users provide the VT service-provider with such information through local management procedures. Whether or not this is necessary in practice depends on the configuration of th
46、e implementations concerned. I I VT servlce-provider Conceptual Communlcatlon Area I I Figure 1 - Control objects in the VT Service model Figure 2 - Control objects in the VT Protocol model The Virtual Terminal Protocol specification given in IS0 9041-I models the VT service-provider in terms of pro
47、tocol exchange between two Virtual Terminal Protocol Machines (VTPMs), each with its own CCA. The CCA of each VTPM is updated both by service primitives received from its own VT- user and by protocol elements received from the peer VTPM. Corresponding service primitives and protocol elements are iss
48、ued by the VTPM to provide notification of changes to the Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:05:28 MDTNo reproduction or networking permitted without license from IHS -,-
49、,- 0 ISO/IEC ISO/IEC ISP 11185-5: 1994(E) content of its CCA. This is illustrated in figure 2. The control object type definition given in this part of ISO/IEC ISP 11185 is expressed in terms of this model. For certain types of control object the abstract syntax of IS0 9041-l does not provide a complete specification for the representation of CO update operations. This arises where the abstract syntax of IS0 9041-l makes use of an ASN. 1 a