1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Z.107 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2016) SERIES Z: LANGUAGES AND GENERAL SOFTWARE ASPECTS FOR TELECOMMUNICATION SYSTEMS Formal description techniques (FDT) Specification and Description Language (SDL)
2、 Specification and Description Language Object-oriented data in SDL-2010 Recommendation ITU-T Z.107 ITU-T Z-SERIES RECOMMENDATIONS LANGUAGES AND GENERAL SOFTWARE ASPECTS FOR TELECOMMUNICATION SYSTEMS FORMAL DESCRIPTION TECHNIQUES (FDT) Specification and Description Language (SDL) Z.100Z.109 Applicat
3、ion of formal description techniques Z.110Z.119 Message Sequence Chart (MSC) Z.120Z.129 User Requirements Notation (URN) Z.150Z.159 Testing and Test Control Notation (TTCN) Z.160Z.179 PROGRAMMING LANGUAGES CHILL: The ITU-T high level language Z.200Z.209 MAN-MACHINE LANGUAGE General principles Z.300Z
4、.309 Basic syntax and dialogue procedures Z.310Z.319 Extended MML for visual display terminals Z.320Z.329 Specification of the man-machine interface Z.330Z.349 Data-oriented human-machine interfaces Z.350Z.359 Human-machine interfaces for the management of telecommunications networks Z.360Z.379 QUAL
5、ITY Quality of telecommunication software Z.400Z.409 Quality aspects of protocol-related Recommendations Z.450Z.459 METHODS Methods for validation and testing Z.500Z.519 MIDDLEWARE Processing environment architectures Z.600Z.609 For further details, please refer to the list of ITU-T Recommendations.
6、 Rec. ITU-T Z.107 (04/2016) i Recommendation ITU-T Z.107 Specification and Description Language Object-oriented data in SDL-2010 Summary Recommendation ITU-T Z.107 defines the object-oriented data features of the Specification and Description Language building on the foundation of the data definitio
7、ns and expressions defined in Recommendation ITU-T Z.104. Together with Recommendations ITU-T Z.100, ITU-T Z.101, ITU-T Z.102, ITU-T Z.103, ITU-T Z.104, ITU-T Z.105 and ITU-T Z.106, this Recommendation is part of a reference manual for the language. The language defined in this Recommendation partia
8、lly overlaps features of the language included in Basic SDL-2010 in Recommendation ITU-T Z.101 and used in Comprehensive SDL-2010 in Recommendation ITU-T Z.102, and the features of Recommendations ITU-T Z.103 and ITU-T Z.104. Coverage The Specification and Description Language has concepts for behav
9、iour, data description and (particularly for larger systems) structuring. The basis of behaviour description is extended finite state machines communicating by messages. Data description is based on data types for values. The basis for structuring is hierarchical decomposition and type hierarchies.
10、Though a distinctive feature of the Specification and Description Language is the graphical representation, the data and expression language is textual. Features to encode and decode data communicated by channels, define data types with values and operations, variables (including parameters) based o
11、n data types and expression actions that use the data types have been defined in previous Recommendations. This Recommendation covers the features of the language used to provide object-oriented, hierarchical abstraction to allow the representation of larger and data-intensive systems. This Recommen
12、dation does not always provide a canonical syntax, but by applying the Model descriptions given, a specification can be transformed to Basic SDL-2010 defined in Recommendation ITU-T Z.101, except in those cases where additional abstract syntax is added in this Recommendation. Applications The Specif
13、ication and Description Language is applicable within standards bodies and industry. The main application areas for which the Specification and Description Language has been designed are stated in Recommendation ITU-T Z.100, but the language is generally suitable for describing reactive systems. The
14、 range of applications is from requirement description to implementation. The features of the language defined in Recommendation ITU-T Z.107 are essential for scalable description of data-intensive systems using object-oriented abstractions. History Edition Recommendation Approval Study Group Unique
15、 ID* 1.0 ITU-T Z.107 2012-04-29 17 11.1002/1000/11595 2.0 ITU-T Z.107 2016-04-29 17 11.1002/1000/12861 Keywords Specification and Description Language, SDL-2010, object-oriented data. _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, follo
16、wed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T Z.107 (04/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologie
17、s (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunic
18、ation Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of
19、information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating
20、 agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or
21、 some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice
22、or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development
23、 process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore st
24、rongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Z.107 (04/2016) iii Table of Contents Page 1 Scope . 1 1.1 Ob
25、jective . 1 1.2 Application . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 2 6 General rules . 2 7 Organization of specification and Description Language specifications . 3 8 Structural conc
26、epts 3 9 Agents . 3 10 Communication . 3 11 Behaviour 3 12 Data . 3 12.1 Data definitions 3 12.2 Use of data 6 12.3 Active use of data . 8 iv Rec. ITU-T Z.107 (04/2016) Introduction Status/Stability This Recommendation is part of the ITU-T Z.100 to ITU-T Z.107 series of Recommendations that give the
27、 complete language reference manual for SDL-2010. The text of this Recommendation is stable. For more details see Recommendation ITU-T Z.100. Rec. ITU-T Z.107 (04/2016) 1 Recommendation ITU-T Z.107 Specification and Description Language Object-oriented data in SDL-2010 1 Scope This Recommendation de
28、fines the object-oriented data features of the Specification and Description Language. The features defined in this document include: polymorphic object-oriented data including virtual methods, multiple inheritance of abstract types, run-time type identification and type coercion, as well as accessi
29、ng data values by references. Without these features the language would afford limited scalability and be unsuitable for the definition of real-time embedded software applications. For this reason, specifications in the Specification and Description Language use ITU-T Z.107 features. Together with I
30、TU-T Z.100, ITU-T Z.101, ITU-T Z.102, ITU-T Z.103, ITU-T Z.104, ITU-T Z.105 and ITU-T Z.106, this Recommendation forms a reference manual for the language. 1.1 Objective The objective of this Recommendation is to fully define the object-oriented data related features of the Specification and Descrip
31、tion Language. Some of the ITU-T Z.107 material is also in ITU-T Z.100, ITU-T Z.101 and ITU-T Z.104. These definitions should be entirely consistent. The descriptions in ITU-T Z.100 and ITU-T Z.101 are overviews to enable data to be used with other features of SDL-2010. The ITU-T Z.104 definition is
32、 intended to be complete (with the exception of definition of data types in ASN.1 modules see ITU-T Z.105). The ITU-T Z.107 definition extends the language with object-oriented data. 1.2 Application This Recommendation is part of the reference manual for the Specification and Description Language. T
33、he use of object-oriented data is fundamental to the description of scalable and efficient real-time embedded applications. Thus, it is almost certain that some features defined in Recommendation ITU-T Z.107 will appear in any specification of applications in SDL-2010. 2 References The following ITU
34、-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendatio
35、n are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it,
36、 as a stand-alone document, the status of a Recommendation. ITU-T T.50 Recommendation ITU-T T.50 (1992), International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T Z.100 Recommendation ITU-
37、T Z.100 (2016), Specification and Description Language Overview of SDL-2010. ITU-T Z.101 Recommendation ITU-T Z.101 (2016), Specification and Description Language Basic SDL-2010. 2 Rec. ITU-T Z.107 (04/2016) ITU-T Z.102 Recommendation ITU-T Z.102 (2016), Specification and Description Language Compre
38、hensive SDL-2010. ITU-T Z.103 Recommendation ITU-T Z.103 (2016), Specification and Description Language Shorthand notation and annotation in SDL-2010. ITU-T Z.104 Recommendation ITU-T Z.104 (2016), Specification and Description Language Data and action language in SDL-2010. ITU-T Z.105 Recommendatio
39、n ITU-T Z.105 (2016), Specification and Description Language SDL-2010 combined with ASN.1 modules. ITU-T Z.106 Recommendation ITU-T Z.106 (2016), Specification and Description Language Common interchange format for SDL-2010. ITU-T Z.111 Recommendation ITU-T Z.111 (2016), Notations and guidelines for
40、 the definition of ITU-T languages. ISO/IEC 10646 ISO/IEC 10646:2012, Information technology Universal Coded Character Set (UCS). 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the terms defined in ITU-T Z.100, with the additions given in ITU-T Z.101, ITU-T Z.102, ITU-T Z.103, IT
41、U-T Z.104, ITU-T Z.105 and ITU-T Z.106. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms The abbreviations given in ITU-T Z.100 apply. 5 Conventions The conventions defined in ITU-T Z.100 apply, which includes the conventions defined in ITU-T Z.111. Where an abstract or co
42、ncrete syntax rule is defined in this Recommendation with the same name as a rule in ITU-T Z.101, ITU-T Z.102, ITU-T Z.103 or ITU-T Z.104, the rule given here replaces the rule in ITU-T Z.101, ITU-T Z.102, ITU-T Z.103 or ITU-T Z.104. Any Abstract grammar or Concrete grammar condition, Semantics and
43、Model defined on a named rule in ITU-T Z.101, ITU-T Z.102, ITU-T Z.103 or ITU-T Z.104 apply to the redefined rule, unless specifically defined otherwise in this Recommendation. Some numbered clauses are included so that this Recommendation has the general structure and numbering of ITU-T Z.104, and
44、in the text states “See ITU-T Z.104“. In these cases the clause includes features defined for the correspondingly numbered clause (including any subordinate clauses if not also included in this Recommendation) in ITU-T Z.101, ITU-T Z.102, ITU-T Z.103 or ITU-T Z.104. 6 General rules See ITU-T Z.104.
45、Rec. ITU-T Z.107 (04/2016) 3 7 Organization of specification and Description Language specifications See ITU-T Z.104. 8 Structural concepts See ITU-T Z.104. 9 Agents See ITU-T Z.104. 10 Communication See ITU-T Z.104. 11 Behaviour See ITU-T Z.104. 12 Data The concept of data in SDL-2010 is extended f
46、rom ITU-T Z.104 by the support for object-oriented data. 12.1 Data definitions Data definitions are extended from ITU-T Z.104 to support object-oriented data and multiple inheritance of abstract types. Abstract grammar Value-data-type-definition : Sort Data-type-identifier Literal-signature-set Null
47、-literal-signature Static-operation-signature-set Dynamic-operation-signature-set Procedure-definition-set Data-type-definition-set Syntype-definition-set Default-initialization Abstract The Null-literal-signature is the unique element of any value sort denoted by null. Semantics Every value sort co
48、ntains a unique named element, the Null-literal-signature that does not identify any value. An attempt to obtain a value from the Null-literal-signature raises the predefined exception InvalidReference, except in the case the access is the First-operand or Second-operand of an Equality-expression, o
49、r the access is the Expression of an Assignment. The Null-literal-signature of a Value-data-type-definition is the signature for the null literal operator. 12.1.1 Data type definition See ITU-T Z.104. 12.1.2 Interface definition See ITU-T Z.104. 4 Rec. ITU-T Z.107 (04/2016) 12.1.3 Operation signature ITU-T Z.104 is extended to support virtual methods. Abstract grammar Dynami
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