1、BRITISH STANDARD BS ISO/IEC 15476-3:2006 Information technology CDIF semantic metamodel Part 3: Data definitions ICS 35.080 BS ISO/IEC 15476-3:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3 February 2006 BSI 3 February 2006 ISBN 0 580
2、 47770 3 National foreword This British Standard reproduces verbatim ISO/IEC 15476-3:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/15, Software and system engineering, which has the responsibility to: A list of or
3、ganizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence I
4、ndex”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself c
5、onfer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgat
6、e them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to viii, pages 1 to 88, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments
7、 issued since publication Amd. No. Date Comments Reference number ISO/IEC 15476-3:2006(E)INTERNATIONAL STANDARD ISO/IEC 15476-3 First edition 2006-01-01 Information technology CDIF semantic metamodel Part 3: Data definitions Technologies de linformation Mtamodle smantique CDIF Partie 3: Definition d
8、e donnes BS ISO/IEC 15476-3:2006ii iii Contents 1 Scope.1 2 Conformance.2 2.1 General2 2.2 Input conformance2 2.3 Output conformance.2 2.4 Round-trip conformance3 3 Normative references.3 4 Terms and definitions.4 4.1 From other International Standards 4 4.1.1 ISO/IEC 15474-1.4 4.1.2 ISO/IEC 13238-1
9、.4 4.1.3 For this International Standard 4 5 Symbols (and abbreviated terms)5 5.1 Naming, diagramming and definition conventions 5 5.2 Abbreviations5 6 Data definition subject area overview .5 6.1 Introduction.5 6.2 Data Typing.5 6.3 The General Structuring Mechanism.5 6.3.1 Introduction.5 6.3.2 Met
10、a-entities and Meta-relationships 5 6.3.3 DefinitionObject and ComponentObject .7 6.4 Alternate Decompositions8 6.5 Pointers and Arrays10 6.6 Data Types.10 6.7 Constraining Data Type and Attribute Values 11 6.8 Units for Numeric DataTypes.12 6.9 Void and Unknown Data Types13 6.10 Computable Language
11、s.13 6.11 Formats for Computable Values 13 6.12 Diagrams16 7 Data definitions subject area summary.21 7.1 AttributableMetaObject classification hierarchy 21 7.2 MetaEntity summary.23 7.3 MetaRelationship summary37 8 Data definitions subject area specification.39 8.1 Introduction.39 8.1.1 Subject are
12、a definition39 8.2 Meta-entity definitions39 8.2.1 AggregateDataType39 8.2.2 ApproximateNumericType40 8.2.3 ArrayQualifier41 8.2.4 Attribute.42 8.2.5 BasicDataType42 8.2.6 BinaryCodedDecimalType43 8.2.7 BinaryType43 8.2.8 BooleanType.44 8.2.9 BoundedArrayQualifier.44 8.2.10 CartesianComplexType45 BS
13、 ISO/IEC 15476-3:2006iv 8.2.11 ComplexType46 8.2.12 DataType47 8.2.13 DateType48 8.2.14 DayTimeIntervalType49 8.2.15 DefinitionObject49 8.2.16 EnumerationType49 8.2.17 ExactNumericType50 8.2.18 FixedDecimalType.51 8.2.19 FixedLengthBinaryType.52 8.2.20 FixedLengthStringType54 8.2.21 IntegerType55 8.
14、2.22 MagnitudeType55 8.2.23 MoneyType56 8.2.24 NLFixedLengthStringType.57 8.2.25 NLVariableLengthStringType.58 8.2.26 NumericType.59 8.2.27 PackedDecimalType.59 8.2.28 PointerQualifier.60 8.2.29 PolarComplexType60 8.2.30 QualifiedDataType.62 8.2.31 Qualifier.62 8.2.32 RefinedDataType.63 8.2.33 Seria
15、lType63 8.2.34 StringType.65 8.2.35 TemporalType.66 8.2.36 TimeIntervalType.66 8.2.37 TimeStampType67 8.2.38 TimeType.68 8.2.39 UnboundedArrayQualifier69 8.2.40 Unit.70 8.2.41 ValueDomain.74 8.2.42 ValueDomainEnumeration75 8.2.43 ValueDomainGroup.76 8.4.44 ValueDomainProcedure77 8.2.45 ValueDomainRa
16、nge78 8.2.46 ValueDomainRule80 8.2.47 VariableLengthBinaryType.81 8.2.48 VariableLengthStringType82 8.2.49 VoidType84 8.2.50 YearMonthIntervalType84 8.3 Meta-relationship definitions.85 7.3.1 ArrayQualifier.HasType.DataType.85 7.3.2 DataType.TakesValueFrom.ValueDomain.85 7.3.3 NumericType.IsMeasured
17、In.Unit86 8.3.1 RootEntity.IsRelatedTo. RootEntity.86 8.3.2 QualifiedDataType.IsQualificationOf.DataType 86 8.3.3 QualifiedDataType.IsQualifiedBy.Qualifier87 8.3.4 RefinedDataType.IsRefinementOf.DataType.87 8.3.5 ValueDomainGroup.Contains.ValueDomain.88 Table of Illustrations Figure 1 CDIF family of
18、 International Standards 1 Figure 2 Part of general Structuring Mechanism for data definitions subject area 6 Figure 3 Meta-model fragment for simple attribution with defined DataTypes 6 Figure 4 Instance Diagram showing simple attribution with defined DataTypes. 7 BS ISO/IEC 15476-3:2006vFigure 5 I
19、nstance diagram of attributes sharing the same structured definition 8 Figure 6 Instance diagram of alternate Data Structures. 9 Figure 7 Concepts of shared attribute values and definitions. 10 Figure 8 Usage of ValueDomainGroup and ValueDomain. 12 Figure 9 Data Definition Subject Area - Main Diagra
20、m. 16 Figure 10 17 Figure 11 MagnitudeType Subtypes 18 Figure 12 NumericType Subtypes 19 Figure 13 Subtypes and meta-relationships for Qualifier 20 Figure 14 ValueDomainGroup and related meta-entities .2 0 Table of Tables Table 1 Formats for Computable Values 13 Table 2 Notation Used for Computable
21、Values 15 Table 3 Function Values for Computable Values . 15 BS ISO/IEC 15476-3:2006vi Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members
22、 of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organi
23、zations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC
24、Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % o
25、f the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 15476-3 was prepared by Joint Technical Committ
26、ee ISO/IEC JTC 1, Information technology, Subcommittee SC 7, Software and system engineering. ISO/IEC 15476 consists of the following parts, under the general title Information technology CDIF semantic metamodel: Part 1: Foundation Part 2: Common Part 3: Data definitions Part 4: Data models Part 5:
27、Data flow models Part 6: State/event models BS ISO/IEC 15476-3:2006vii Introduction developing mechanisms for interchanging information. This International Standard specifies an element of a family of related standards. When used together, these International Standards specify a mechanism for transf
28、erring information between tools. ISO/IEC 15474-1:2002, Information technology - CDIF framework - Part 1: Overview and ISO/IEC 15474-2, Information technology - CDIF framework - Part 2: Modelling and extensibility should be read first when initially exploring CDIF. The first explains the overall CDI
29、F architecture and how the family of standards fits together. The second explains the scope, and modelling approach in CDIF. The CDIF meta-metamodel and extensibility mechanism are also defined in that document. This International Standard explains the data definitions subject area of the CDIF seman
30、tic metamodel, which defines the primitive data types and the objects which are used for structured data. The CDIF semantic metamodel is used to ensure that the information transferred by tools communicating using CDIF is expressed with an agreed meaning. This International Standard has been develop
31、ed with the wide support and participation of vendors, users, academia and government involved in or familiar with the CASE industry, its products and the general requirements associated with interchanging information between these products. This document is organized into the following Clauses: Cla
32、use 1 to 5 are prescribed ISO/IEC Clauses. Clause 6: Subject area overview: This Clause gives an overview of the coverage of this subject area. Clause 7: Subject area summary: This Clause gives an overview of the content of this subject area. Clause 8: Subject area specification: This Clause gives t
33、he formal specification of all the objects defined in the subject area, and the formal reference to those used, but not defined in the subject area. This document is intended to be used by anyone wishing to understand and/or use CDIF. This document provides a definition of a single subject area of t
34、he CDIF semantic metamodel. It is suitable for: Those evaluating CDIF; Those who wish to understand the principles and concepts of a CDIF transfer; and Those developing importers and exporters. This document, ISO/IEC 15474-1:2002, Information technology - CDIF framework - Part 1: Overview, and the f
35、ramework document ISO/IEC 15474-2:2002, Information technology - CDIF framework - Part 2: Modelling and extensibility, should be read first when initially exploring CDIF and before attempting to read other documents in the CDIF family of International Standards. This International Standard will assi
36、st the vendors and users of modelling tools and meta-data repositories in BS ISO/IEC 15476-3:2006viii While there are no specific prerequisites for reading this document, it will be helpful for the reader to have familiarity with the following: Entity-Relationship-Attribute modelling; Modelling (CAS
37、E) tools; Information repositories; Data dictionaries; and Multiple meta-layer modelling. BS ISO/IEC 15476-3:200611 Scope The CDIF family of International Standards is primarily designed to be used as a description of a mechanism for transferring information between modelling tools. It facilitates a
38、 successful transfer when the authors of the importing and exporting tools have nothing in common except an agreement to conform to CDIF. The language that is defined for the transfer format also has applicability as a general language for import/export from repositories. The CDIF semantic metamodel
39、 defined for CASE also has applicability as the basis of standard definitions for use in repositories. The International Standards which form the complete family of CDIF standards are documented in ISO/IEC 15474- 1:2002, Information technology CDIF framework Part 1: Overview. These standards cover t
40、he overall framework, the transfer format and the CDIF semantic metamodel. 15476 CDIF semantic metamodel 15474 CDIF framework Part 1 : Overview Part 2 : Modelling and extensibility Part 1 : Foundation Part 6 : State/event models Part 3 : Data definitions Part 4 : Data models Part 5 : Data flow model
41、s 15475 CDIF transfer format Part 1 : General rules for syntaxes and encodings Part 2 : Syntax SYNTAX.1 Part 3 : Encoding ENCODING.1 Part n : . Part n : . Part 2 : Common Figure 1 CDIF family of International Standards The diagram in Figure 1 depicts the various International Standards that comprise
42、 the CDIF family of standards. The shaded box depicts this International Standard and its position in the CDIF family of standards. Information technology CDIF semantic metamodel Part 3: Data definitions BS ISO/IEC 15476-3:20062 This International Standard defines the Data Definition Subject Area of
43、 the CDIF semantic metamodel. This subject area contains meta-objects that are used as the basis of the data components of other subject area standards, and also meta-relationships and meta-attributes that are applicable to all data-related meta-objects. 2 Conformance 2.1 General A product is fully
44、standards conformant to a CDIF subject area standard if and only if it is input-conformant, output- conformant and round-trip conformant to each and every MetaEntity, MetaRelationship, MetaAttribute, and AttributableMetaObject which is defined and/or used in that standard, and it is also CDIF archit
45、ecture conformant. A product may be partially input-conformant, and/or partially output-conformant, and/or partially round-trip conformant to a CDIF subject area standard. 2.2 Input conformance Input conformance for a specific MetaEntity, MetaRelationship, MetaAttribute, or AttributableMetaObject (s
46、hort: CollectableMetaObject) is determined by applying the following test: A set of meta-data containing all meanings and structures standardized by a CDIF subject area is imported by the product under test. Then the meta-data which has arrived in the product is examined. The following options exist
47、 for the relation between the input (CDIF) meta-data and the imported (product) meta-data: For a specific CollectableMetaObject: 1 The product is input conformant if each instance of the specific CollectableMetaObject has arrived in the product without change of meaning or structure. If the Collecta
48、bleMetaObject is a meta-entity or meta-relationship, its structural relationships to other CollectableMetaObjects have been preserved. If the CollectableMetaObject is a meta-attribute, the value of the meta-attribute has been preserved. 2 The product is input morphing conformant if each instance of
49、the specific CollectableMetaObject has arrived in the product, but with some changes in meaning or structure. If the CollectableMetaObject is a meta-attribute, the value(s) for some instances of the meta-attribute have changed. 3 The product is not input conformant for that CollectableMetaObject if neither of the previous tests is satisfied. 2.3 Output conformance Output conformance for a specific Coll
