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1、INTERNATIONAL STANDARDIZED PROFILE ISOIIEC ISP 11186-4 First edition 1997-12-15 Information technology - International Standardized Profiles FVT3nn - Virtual Terminal Basic Class - Register of attribute assignment type definitions - Part 4: FVT322 - Font Assignment Type No. 2 Technologies de /inform
2、ation - Profils normalis - European Workshop for Open Systems (EWOS); - Open Systems Environment Implementors Workshop (OIW). ISO/IEC ISP 11186 consists of the following parts, under the general title information technology - International Standardized Profiles M3nn - Virtual Terminal Basic Class -
3、Register of attribute assignment type definitions. - Part 1: FVT321 - Font Assignment Type No.1 - Part 2: FVT311 - Repertoire Assignment Type for ISOllEC 10646 - Part 3: FVT312 - Repertoire Assignment Type for ISOIIEC 2022 Level 2 - Part 4: FVT322 - Font Assignment Type No.2 Annex A of this part of
4、ISO/IEC ISP 11186 is for information only. . . . III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:49:54 MDTNo reproduction or networking permitted without license from IHS -,-,- IS
5、O/IEC ISP 11186-4: 1997(E) o ISO/IEC Introduction ISO/IEC ISP 11186 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 context of Functional Standardization
6、 is one part of the overall field of Information Technology (IT) standardization activities, covering base standards, profiles and registration mechanisms. The Open Systems Interconnection (0%) Standard IS0 9040 for the Virtual Terminal Basic Class Service provides for the identification of attribut
7、e assignment types by means of ASN.1 object identifiers. This International Standardized Profile provides a means for the registration of such attribute assignment type definitions in accordance with ISO/IEC 9834-l. The individual entries in this register constitute Interchange Format and Representa
8、tion Profiles (F-Profiles) within the framework of ISO/IEC TR 10000. This part of ISO/IEC ISP 11186 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 Open Systems (EWOS) and the OSI
9、Asia- Oceania Workshop (AOW). The text is harmonized between these three Workshops and it has been ratified by the plenary assemblies of each Workshop. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resal
10、e, 04/24/2007 09:49:54 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDIZED PROFILE So”EC ISO/IEC ISP 11186-4: 1997(E) Information technology - International Standardized Profiles FVT3nn - Virtual Terminal Basic Class - Register of attribute assignment
11、 type definitions - Part 4: FVT322 - Font Assignment Type No.2 1 Scope 1 .l General The concept of Profiles for OS, 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
12、-classes. Two of these classes contain sub-classes comprising functions of the Virtual Terminal Basic Class 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).
13、 The relationship between A-Profiles and F-Profiles is described in 7.3.2 of ISO/IEC TR 10000-l and is as 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
14、the purpose of F-Profiles to specify such information structures. Particular functional requirements may then 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 p
15、rofile (VTE-profile), and of particular values for any arguments of that VTE-profile. The VTE-profile specification, and possibly also the values of certain VTE-profile arguments, may in turn reference the definitions of VT control object types and attribute assignment types. These VTE-profiles, con
16、trol object types and attribute assignment types are therefore Information Objects that require explicit reference within the VT protocol. Particular instances of these Information Objects are fully defined within the base standards, but the base standards also provide for further instances to be de
17、fined by registration. Each registered instance constitutes an F-Profile within the framework of ISO/IEC TR 10000. The Virtual Terminal Basic Class Service and Protocol may be used to realise a wide range of distinct functions. Particular functions may be realised through the selection of appropriat
18、e VT functional units, F-Profiles and other VTE- profile argument values. The specification of the selection required to reaiise a particular function and to promote interoperability constitutes a Virtual Terminal A-Profile within the framework of ISO/IEC TR 10000. The three International Registers
19、of VT information objects and the specifications of VT Application Profiles are each published as a separate multi-part ISP as follows: - lSO/lEC ISP 11184 is the Register of GTE-profiles; - ISO/IEC ISP 11185 is the Register of control object type definitions; - ISO/IEC ISP 11186 is the Register of
20、attribute assignment type definitions; - ISO/IEC ISP 11187 contains the specifications of VT Application Profiles. This part of ISO/IEC ISP 11186 provides the specification of a font assignment type that may be used to specify a font assignment value in which different font property values may be as
21、signed to different characters within a single VT character-repertoire. This font assignment type is intended for use in conjunction with a repertoire assignment type that permits the characters of more than one script to be present in a single VT character-repertoire. It is particularly suited for
22、use in conjunction with the repertoire assignment type for ISOilEC 10646 whose specification is given in lSO/lEC ISP 11186-2. It is intended that font property values should be assigned on a script-by-script basis, for example so that scripts with a left-to-right writing mode and with a right-to-lef
23、t writing mode may coexist within a single VT character- repertoire. 1.2 Position within 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 St
24、andardized Profile are in the Virtual Terminal Registered Object sub-class of the class 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 Pr
25、ofile within each of the three levels of subdivision of the subclass. The values of a and b are single digits but c is an integer that is not necessarily a single digit. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960
26、866100 Not for Resale, 04/24/2007 09:49:54 MDTNo reproduction or networking permitted without license from IHS -,-,- ISQhEC ISP 11186-4: 1997(E) In principle the IS0 Virtual Terminal model allows for multiple classes of operation, although at the time of publication of this International Standardize
27、d Profi!e only the Basic Class has been defined. The value of the identifier component a 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. Values of a greater
28、 than 3 are reserved for future developments. This International Standardized Profile ISO/IEC ISP 11186 contains the specifications of the Profiles with identifiers of the form FVT3bc. For this form of identifier, the component b distinguishes between the three attributes of display object array ele
29、ments for which assignment types are defined in accordance with IS0 9040. The values of b are allocated as follows: - b = 1 for repertoire assignment types; - b = 2 for font assignment types; - b = 3 for colour assignment types. The identifier component c is the serial number of the attribute assign
30、ment type in the sub-register for the particular attribute concerned. Values of b greater than 3 are reserved for further attributes that may be defined as subject to registration in future amendments to IS0 9040. This part of ISO/IEC ISP 11186 contains the definition of the font assignment type wit
31、h the Profile identifier FVl322 - Font Assignment Type No.2. 1.3 Scenario The specification of the Virtual Terminal Service is 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 serv
32、ice-provider. Information exchange is modelled by one VT-user updating the content of the CCA and the changed state of the CCA then being made accessible to the peer VT-user. The CCA is structured by the Virtual Terminal Service into a number of components. Of these components, the Conceptual Data S
33、tore (CDS) contains one or two display objects (DOS), each of which includes a one, two or three dimensional array of array elements. Each array element is either empty or has a content that consists of a primary attribute and a number of secondary attributes, The primary attribute value selects one
34、 character-box graphic element from a repertoire of such elements that is determined by the character-repertoire secondary attribute. The other secondary attributes are the font, emphasis, foreground-colour and background-colour attributes which are collectively referred to as rendition attributes.
35、The values permitted for the secondary attributes are specified by attribute assignments that are included among the parameters Of a Virtual Terminal Environment (VTE). The 2 0 ISO/IEC font attribute is subservient to the character-repertoire attribute in that a separate set of permitted values for
36、the font attribute is specified for each permitted value of the character- repertoire attribute. The values permitted for the other secondary attributes are mutually independent. With the exception of the emphasis attribute, an attribute assignment is composed of two parts, a type and a value. For t
37、he emphasis attribute, the syntax of permitted values is prescribed by the VT service base standard IS0 9040 and the semantics of each value is determined by the specification of the VTE-profile currently in use. For all other secondary attributes, the assignment type determines both the syntax of t
38、he permitted values and the semantic interpretation of each such value. VT service-provider Conceptual Communication Area Figure 1 - Attribute assignment types in the VT Service model Assignment type definitions are required for only three distinct attributes, namely repertoire, font and colour, sin
39、ce both foreground-colour and background-colour secondary attributes reference the same assignment types. The attribute assignments specified by the parameter values of a VTE, and the assignment type definitions to which they refer, are held in the Data Structure Definition (DSD) component of the CC
40、A. This is illustrated in figure 1, in which RepAT-1, RepAT-2, RepAT-n represent a number of different repertoire assignment types, FontAT-1, FontAT-2, FontAT-n represent a number of different font assignment types and ColAT-1, ColAT-2, ,. ColAT-n represent a number of different colour assignment ty
41、pes. The negotiation during establishment of a VT-association will determine whether or not these will include the attribute assignment type whose definition is given in this part of ISO/IEC ISP 11186. NOTE - A VTE-profile specification may prescribe the attribute assignments that are present in any
42、 VTE established by its use, or may provide VTE-profile arguments for the negotiation of these attribute assignments, or may use a combination of these methods. Where some or all of the attribute assignments are determined by negotiation, attribute assignment types are referenced by their registered
43、 name. The permitted syntax of the corresponding attribute assignment value is determined by the definition that has this registered name. Since the VT service-provider is not required to have knowledge of these registered definitions, in principle the VT-users provide the VT service-provider with s
44、uch information through local management procedures. Whether or not this is necessary in practice depends on the nature of the implementations concerned. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Res
45、ale, 04/24/2007 09:49:54 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 ISO/IEC ISO/IEC ISP 11186-4: 1997(E) 2 Normative references 4 any type; The following documents contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC
46、 ISP 11186. At the time of publication, the editions indicated were valid. All documents are subject to revision, and parties to agreements based on this International Standardized Profile are warned against automatically applying any more recent editions of the documents listed below, since the nat
47、ure of references made by ISPs to such documents is that they may be specific to a particular edition. Members of IEC and IS0 maintain registers of currently valid International Standards and ISPs, and ITU-T maintains published editions of its current Recommendations. ISO/IEC 8824: 1990, information
48、 technology - Open Systems interconnection - Specification of Abstract Syntax Notation One (ASN.7). (See also CCITT Recommendation X.208.) ISO/IEC 9040: 1997, information technology - Open Systems Interconnection - Virtual Terminal Basic Class Service. ISO/IEC 9041-l : 1997, Information technology -
49、 Open Systems Interconnection - Virtual Terminal Basic Class Protocol - Part 1: Specification. ISO/IEC 9541-l : 1991, Information technology - Font information interchange - Part 1: Architecture. ISO/IEC 9834-l :1993, Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: General procedures. (See also CCITT Recommendation X.660.) ISO/IEC TR 10000-l : 1995, Information technol