Intelligent transport systems - DATEX II data exchange specifications for traffic management and information - Part 1: Context and framework

This Technical Specification (FprCEN/TS 16157-1) specifies and defines component facets required to support the exchange and shared use of data and information in the field of traffic and travel.
The component facets include the framework and context for exchanges, the modelling approach, data content, data structure and relationships, communications specification.
This Technical Specification is applicable to:
-   Traffic and travel information which is of relevance to road networks (non urban and urban),
-   Public transport information that is of direct relevance to the use of a road network (e.g. road link via train or ferry service).
This Technical Specification establishes specifications for data exchange between any two instances of the following actors:
-   Traffic Information Centres (TICs),
-   Traffic Control Centres (TCCs),
-   Service Providers (SPs),
Use of this Technical Specification may be applicable for use by other actors.
This Technical Specification covers, at least, the following types of informational content:
-   Road traffic event information - planned and unplanned occurrences both on the road network and in the surrounding environment,
-   Operator initiated actions,
-   Road traffic measurement data, status data, and travel time data,
-   Travel information relevant to road users, including weather and environmental information,
-   Road traffic management information and information and advice relating to use of the road network.
This part of FprCEN/TS 16157 specifies the DATEX II framework of all parts of this Technical Specification, the context of use and the modelling approach taken and used throughout these Technical Specifications. This approach is described using formal methods and provides the mandatory reference framework for all other parts.

Intelligente Verkehrssysteme - DATEX II Datenaustauschspezifikation für Verkehrsmanagement und Verkehrsinformation - Teil 1: Kontext und Rahmenwerk

Systèmes de transport intelligents - Spécifications DATEX II d'échange de données pour la gestion du trafic et l'information routière - Partie 1: Contexte et cadre général

La présente Spécification Technique (FprCEN/TS 16157-1) stipule et définit les composantes requises pour la
prise en charge de l'échange et de l'utilisation partagée de données et d'informations aux voyageurs sur la
circulation.
Ces composantes comprennent le cadre et le contexte des échanges, la démarche de modélisation, le
contenu des données, leur structure et leurs relations ainsi que les spécifications de communication.
La présente Spécification Technique est applicable :
⎯ aux informations aux voyageurs sur la circulation qui sont pertinentes pour les réseaux routiers (non
urbains et urbains),
⎯ aux informations sur les transports publics qui sont pertinentes pour l'utilisation d'un réseau routier (par
exemple les liaisons routières via les services ferroviaires et maritimes).
La présente Spécification Technique établit les spécifications d'échange de données ayant lieu entre deux
des acteurs suivants :
⎯ les centres d'information routière (CIR),
⎯ les centres de gestion du trafic (CGT),
⎯ les opérateurs de services (FS),
La présente Spécification Technique peut être utilisée par d'autres acteurs.
La présente Spécification Technique couvre, au moins, les types de contenus d'informations suivants :
⎯ les informations concernant les événements ayant trait au trafic routier - qu'ils aient lieu sur le réseau
routier ou dans son proche environnement, qu'ils soient planifiés ou non,
⎯ les actions effectuées à l'initiative d’un exploitant,
⎯ les données de comptage et d'état du trafic routier et les données de temps de parcours,
⎯ les informations aux voyageurs pertinentes pour les usagers de la route, y compris les informations
météorologiques et environnementales,
⎯ les informations de gestion du trafic routier et les informations et conseils relatifs à l'utilisation du réseau
routier.

Inteligentni transportni sistemi - Specifikacije za izmenjavo podatkov DATEX II pri upravljanju prometa in informiranju - 1. del: Skladnost in okvir

Ta tehnična specifikacija (FprCEN/TS 16157-1) določa in definira vidike komponent, potrebne za podporo izmenjave in skupne uporabe podatkov in informacij na področju prometa in potovanja.
Vidiki komponent vključujejo okvir in kontekst za izmenjave, pristope modeliranja, vsebino podatkov, podatkovne strukture in odnose, specifikacijo komunikacij.
Ta tehnična specifikacija velja za:
- informacije o prometu in potovanju, ki so pomembne za cestna omrežja (neurbana in urbana),
- informacije javnega prevoza, ki so neposredno pomembne za uporabo cestnega omrežja (npr. cestne povezave z železniško ali trajektno storitvijo).
Ta tehnična specifikacija vzpostavlja specifikacije za podatkovno izmenjavo med katero koli izmed instanc naslednjih udeležencev:
- prometnoinformacijski centri (TIC),
- prometnokontrolni centri (TCC),
- ponudniki storitev (SP).
Uporaba te tehnične specifikacije lahko velja, kadar jo uporabljajo drugi udeleženci.
Ta tehnična specifikacija zajema vsaj naslednje vrste informativne vsebine:
- informacije o dogodkih v cestnem prometu – načrtovani in nenačrtovani dogodki na cestnem omrežju in v bližnjem okolju,
- kakor jih sporoča operater sprožene akcije,
- podatke o merjenju cestnega prometa, statusne podatke in podatke o času potovanja,
- potovalne informacije, pomembne za uporabnike cest, vključno z vremenom in okoljskimi informacijami,
- informacije nadzora cestnega prometa ter informacije in nasvete, povezane z uporabo cestnega omrežja.
Ta del FprCEN/TS 16157 določa okvir DATEX II za vse dele te tehnične specifikacije, kontekst uporabe ter izbrani pristop modeliranja, ki se uporablja v teh tehničnih specifikacijah. Ta pristop je opisan z uporabo formalnih metod in zagotavlja obvezen referenčni okvir za vse druge dele.

General Information

Status
Withdrawn
Publication Date
12-Oct-2011
Withdrawal Date
02-Jan-2019
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
03-Jan-2019
Due Date
26-Jan-2019
Completion Date
03-Jan-2019

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SLOVENSKI STANDARD
SIST-TS CEN/TS 16157-1:2011
01-november-2011
1DGRPHãþD
SIST ENV 13106:2003
SIST ENV 13777:2003
Inteligentni transportni sistemi - Specifikacije za izmenjavo podatkov DATEX II pri
upravljanju prometa in informiranju - 1. del: Skladnost in okvir
Intelligent transport systems - DATEX II data exchange specifications for traffic
management and information - Part 1: Context and framework
Intelligente Verkehrssysteme - DATEX II Datenaustauschspezifikation für
Verkehrsmanagement und Verkehrsinformation - Teil 1: Kontext und Rahmenwerk
Systèmes de transport intelligents - Spécifications DATEX II d'échange de données pour
la gestion du trafic et l'information routière - Partie 1: Contexte et cadre général
Ta slovenski standard je istoveten z: CEN/TS 16157-1:2011
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
SIST-TS CEN/TS 16157-1:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 16157-1:2011

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SIST-TS CEN/TS 16157-1:2011


TECHNICAL SPECIFICATION
CEN/TS 16157-1

SPÉCIFICATION TECHNIQUE

TECHNISCHE SPEZIFIKATION
October 2011
ICS 35.240.60 Supersedes ENV 13106:2000, ENV 13777:2000
English Version
Intelligent transport systems - DATEX II data exchange
specifications for traffic management and information - Part 1:
Context and framework
Systèmes de transport intelligents - Spécifications DATEX Intelligente Transportsysteme - DATEX II Datenaustausch
II d'échange de données pour la gestion du trafic et Spezifikationen für Verkehrsmanagement und
l'information routière - Partie 1: Contexte et cadre général Informationen - Teil 1: Kontext und Rahmenstruktur
This Technical Specification (CEN/TS) was approved by CEN on 10 April 2011 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16157-1:2011: E
worldwide for CEN national Members.

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CEN TS 16157-1:2011
Contents Page
Introduction .5
1 Scope .6
2 Conformance .6
3 Normative references .7
4 Terms and definitions .7
4.1 Terms and definitions adapted from ISO/IEC 19501:2005 .7
4.2 Other terms and definitions .8
5 Symbols and abbreviated terms . 10
6 General conventions and requirements . 10
6.1 Metamodelling . 10
6.2 Naming conventions . 12
6.3 Notational conventions . 13
7 Platform independent model rules. 13
7.1 General . 13
7.2 Numbered list of requirements . 13
8 Predefined model elements . 15
8.1 General . 15
8.2 Top Level model packages and classes . 15
8.3 Basic datatypes. 17
9 Extension Rules . 17
9.1 General . 17
9.2 Numbered list of requirements . 18
Annex A (informative) History and Background of DATEX II . 19
A.1 Introduction . 19
A.2 Separation of payload content and exchange . 19
A.3 Modelling approach: abstract specification and platform mappings . 20
Annex B (informative) UML graphical notation . 22
Annex C (informative) DATEX II Metamodel . 25
C.1 Introduction . 25
C.2 Meta-Metamodel – how to describe a metamodel? . 26
C.3 The DATEX II metamodel . 26
Annex D (normative) XML Schema Definition Mapping . 31
D.1 General . 31
D.2 Platform specific model rules for XML with XML schema definition . 31
D.2.1 General . 31
D.2.2 Numbered list of requirements . 31
D.3 Mapping the PSM to XML Schema Definition . 32
D.3.1 Mapping of "D2Datatype" . 32
D.3.2 Mapping of "D2Enumeration" and "D2Literal" . 33
D.3.3 Mapping of "D2Component" . 33
D.3.4 Mapping of "D2Identifiable" classes. 36
D.3.5 XML elements . 37
D.3.6 Extension mapping . 37
D.3.7 Overall document structure and namespaces . 38
Annex E (normative) General structure element . 39
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E.1 Package "D2LogicalModel" . 39
E.2 Package "PayloadPublication" . 40
E.3 Package "General" . 42
E.4 Package "DataTypes" . 42
E.5 Package "Generic" . 43
Bibliography . 46

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Foreword
This document (CEN/TS 16157-1:2011) has been prepared by Technical Committee CEN/TC 278 “Road
transport and traffic telematics”, the secretariat of which is held by NEN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes ENV 13106:2000, ENV 13777:2000.
As a user of the standard, attention is drawn to the resources of www.datex2.eu. This web site contains
related software tools and software resources that aid the implementation of CEN/TS 16157 DATEX II.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
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Introduction
This Technical Specification defines a common set of data exchange specifications to support the vision of a
seamless interoperable exchange of traffic and travel information across boundaries, including national,
urban, interurban, road administrations, infrastructure providers and service providers. Standardisation in this
context is a vital constituent to ensure interoperability, reduction of risk, reduction of the cost base, promotion
of open marketplaces and many social, economic and community benefits to be gained from more informed
travellers, network managers and transport operators.
Delivering European Transport Policy in line with the White Paper issued by the European Commission
requires co-ordination of traffic management and development of seamless pan European services. With the
aim to support sustainable mobility in Europe, the European Commission has been supporting the
development of information exchange mainly between the actors of the road traffic management domain for a
number of years. In the road sector, DATEX II has been long in fruition, with the European Commission being
fundamental to its development through an initial contract and subsequent co-funding through the Euro-
Regional projects. With this standardisation of DATEX II there is a real basis for common exchange between
the actors of the traffic and travel information sector.
This Technical Specification includes the framework and context for exchanges, the modelling approach, data
content, data structure and relationships, communications specification.
This Technical Specification supports a methodology that is extensible.
The European Committee for Standardisation (CEN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a patent concerning procedures, methods and/or
formats given in this document.
CEN takes no position concerning the evidence, validity and scope of patent rights.
This document (i.e. CEN/TS 16157-1) is targeted towards all stakeholders that want to understand the
modelling methodology applied throughout the DATEX II specifications. While this is potentially a wide range
of readers, the document addresses specifically those users that intend to extend the DATEX II data model
and therefore need to understand – and comply with – the modelling principles, the use of the “Unified
Modeling Language” (UML) and other conventions for DATEX II modelling. The subject matter may be difficult
to address without some basic background about the historical evolution and main design decisions taken.
Users unfamiliar with this background may find a brief summary in Annex A. Users not (yet) familiar with the
UML find a brief introduction in the informative Annex B.
Further to the UML modelling, this Technical Specification also defines the mapping of this model to the
“eXtensible Markup Language” (XML), used for formatting data in DATEX II data exchanges. XML is the most
widely used method nowadays of formatting data for business-to-business data exchange (i.e. centre-to-
centre) over the Internet.
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1 Scope
This Technical Specification (CEN/TS 16157-1) specifies and defines component facets required to support
the exchange and shared use of data and information in the field of traffic and travel.
The component facets include the framework and context for exchanges, the modelling approach, data
content, data structure and relationships, communications specification.
This Technical Specification is applicable to:
 traffic and travel information which is of relevance to road networks (non urban and urban);
 public transport information that is of direct relevance to the use of a road network (e.g. road link via train
or ferry service).
This Technical Specification establishes specifications for data exchange between any two instances of the
following actors:
 Traffic Information Centres (TICs);
 Traffic Control Centres (TCCs);
 Service Providers (SPs).
Use of this Technical Specification may be applicable for use by other actors.
This Technical Specification covers, at least, the following types of informational content:
 road traffic event information – planned and unplanned occurrences both on the road network and in the
surrounding environment;
 operator initiated actions;
 road traffic measurement data, status data, and travel time data;
 travel information relevant to road users, including weather and environmental information;
 road traffic management information and information and advice relating to use of the road network.
This part of CEN/TS 16157 specifies the DATEX II framework of all parts of this Technical Specification, the
context of use and the modelling approach taken and used throughout these Technical Specifications. This
approach is described using formal methods and provides the mandatory reference framework for all other
parts.
2 Conformance
This document provides requirements for UML models (as of ISO/IEC 19501:2005) that claim conformance
with the DATEX II Technical Specifications. UML models claiming this conformance shall comply with the
provisions of the normative clauses and annex of this part. Conformance with metadata constructs is subject
to multiplicity requirements stated explicitly in the model or is implicitly defined in provisions of this Technical
Specification. Metadata constructs with minimum multiplicity of 1 or more shall be present in any data claiming
conformance. Metadata constructs with minimum multiplicity of 0 may be present or may be missing without
violating conformance.
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3 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 639-2:1998, Codes for the representation of names of languages — Part 2: Alpha-3 code
ISO 3166-1:2006, Codes for the representation of names of countries and their subdivisions — Part 1:
Country codes
ISO/IEC 14977:1996, Information technology — Syntactic metalanguage — Extended BNF
ISO/IEC 19501:2005, Information technology — Open Distributed Processing — Unified Modeling Language
(UML) Version 1.4.2
ISO/IEC 19503:2005, Information technology — XML Metadata Interchange (XMI)
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1 Terms and definitions adapted from ISO/IEC 19501:2005
NOTE Definitions have been adapted to meet the particular use of UML within this specification.
4.1.1
association
semantic relationship between classes
4.1.2
association end
endpoint of an association, which connects the association to a class
4.1.3
aggregation
association where the target class is an aggregate; therefore the source class is a part. This characteristic is
expressed in UML with an attribute named “aggregation” on the target side Association End being set to
“aggregate”
4.1.4
attribute
named slot within a class that describes a range of values that instances of the class may hold
4.1.5
class
description of a set of objects that share the same attributes, relationships, and semantics
4.1.6
composition
association where the target class is a composite; therefore the source class is a part that is strongly owned
by the composite and may not be part of any other composite. This characteristic is expressed in UML with an
attribute named “aggregation” on the target side Association End being set to “composite”
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4.1.7
dependency
dependency states that the implementation or functioning of one or more elements requires the presence of
one or more other elements
4.1.8
enumeration
data type whose range is a list of predefined values, called enumeration literals
4.1.9
enumeration Literal
element of the run-time extension of an Enumeration data type
NOTE It has no relevant substructure, that is, it is atomic. The enumeration literals of a particular Enumeration data
type are ordered.
4.1.10
generalization
taxonomic relationship between a more general element and a more specific element
NOTE 1 The more specific element is fully consistent with the more general element (it has all of its properties,
members, and relationships) and may contain additional information.
NOTE 2 In the metamodel, a Generalization is a directed inheritance relationship, uniting a GeneralizableElement with
a more general GeneralizableElement in a hierarchy. Generalization is a subtyping relationship; that is, an Instance of the
more general GeneralizableElement may be substituted by an Instance of the more specific GeneralizableElement.
4.1.11
multiplicity
in the metamodel a MultiplicityRange defines a range of integers. The upper bound of the range cannot be
below the lower bound. The lower bound must be a nonnegative integer. The upper bound must be a
nonnegative integer or the special value unlimited, which indicates there is no upper bound on the range
4.1.12
package
grouping of model elements
4.1.13
stereotype
stereotype concept provides a way of branding (classifying) model elements so that they behave in some
respects as if they were instances of new virtual metamodel constructs. These model elements have the same
structure (attributes, associations, operations) as similar non-stereotyped model elements of the same kind.
The stereotype may specify additional constraints and tag definitions that apply to model elements. In
addition, a stereotype may be used to indicate a difference in meaning or usage between two model elements
with identical structure
4.1.14
tagged value
tagged value allows information to be attached to any model element in conformance with its tag definition.
Although a tagged value, being an instance of a kind of ModelElement, automatically inherits the name
attribute, the name that is actually used in the tagged value is the name of the associated tag definition. The
interpretation of tagged values is intentionally beyond the scope of UML semantics. It must be determined by
user or tool conventions that may be specified in a profile in which the tagged value is defined
4.2 Other terms and definitions
4.2.1
binary (association)
association that connects exactly two classes
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4.2.2
globally unique identifier
GUID
Globally Unique Identifier that is unique in space and time, i.e. no other object will ever have the same
identifier at any other place and at any time
4.2.3
lower camel case
LCC
Camel Case describes the practice of concatenating compound phrases without whitespace in between where
phrases are delimited by upper case letters. Lower Camel Case describes the case where the initial letter is
lower case, e.g. as in lowerCamelCase
4.2.4
model element
generic term for any construct of metadata used within a model to specify a particular aspect or element of
this model
4.2.5
Platform Independent Model
PIM
model of aspects of an information system (e.g. the data model) that is independent of any technical platform
used to implement the model. Concrete implementations can be derived from the platform independent model
by platform specific models or mappings
4.2.6
platform specific model
PSM
model of aspects of an information system (e.g. the data model) that is linked to a specific technological
platform (e.g. a specific programming language or data transfer syntax)
4.2.7
upper camel case
UCC
Camel Case describes the practice of concatenating compound phrases without whitespace in between where
phrases are delimited by upper case letters. Lower Camel Case describes the case where the initial letter is
upper case, e.g. as in UpperCamelCase
4.2.8
unique resource identifier / locator
URI / URL
character string of well defined structure used to uniquely identify a resource. If that string is actually pointing
at a resource accessible via the Internet, it is called a Unique Resource Locator
4.2.9
extensible markup language
XML
set of rules for encoding electronic documents define by the World Wide Web Consortium W3C. Although
developed for documents, it is today widely used for data exchange in general, usually in conjunction with an
XML Schema Definition
4.2.10
XML metadata interchange
XMI
XML based specification for the interoperable exchange of metadata. It is today most commonly used to
exchange UML models between UML tools. XMI is specified in ISO/IEC 19503:2005
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4.2.11
XML schema definition
XSD
XML Schema Definition is a formal description of the allowed content of an XML document that claims
compliance to the schema. XML Schema Definitions allow for formal validation of syntactical compliance of
instance documents
5 Symbols and abbreviated terms
GUID  Globally Unique identifier
LCC  Lower Camel Case
PIM  Platform Independent Model
PSM  Platform Specific Model
UCC  Upper Camel Case
UML  Unified Modeling Language
URI  Universal Resource Identifier
URL  Universal Resource Locator
W3C  World Wide Web Consortium
XMI  XML Metadata Interchange
XML  eXtensible Markup Language
XSD  XML Schema Definition
6 General conventions and requirements
6.1 Metamodelling
The DATEX II modelling methodology (see Annex C) uses the Unified Modeling Language (UML), version
1.4.2 as specified in UML ISO/IEC 19501:2005. UML provides a vast set of modelling elements that are not all
used for DATEX II data modelling. Further to the selection of UML modelling elements, this clause also
provides requirements for DATEX II modelling regarding the use of these elements. Models that claim to
comply with this specification may use these UML elements but shall comply with all provisions regarding the
use of these elements. Annex B provides a brief introduction into the UML constructs used for DATEX II,
although the authors recognise that there is plenty – presumably better – introductory material available to
learn about UML in general and would like to refer the reader to these resources for further study.
Note that this clause no provisions are made regarding the existence and use of other UML elements. Thus,
compliant models may use these other elements, but they have no defined semantics in the framework of this
Technical Specification.
DATEX II compliant models may use the following metaclasses and metaattributes from the UML "Core"
package:
 Class
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 Class.name
 Class.isAbstract
 Class.feature
 Class.association
 Association
 Association.connection
 AssociationEnd
 AssociationEnd.name
 AssociationEnd.aggregation
 AssociationEnd.multiplicity
 AssociationEnd.qualifier
 AssociationEnd.participant
 Attribute
 Attribute.name
 Attribute.multiplicity
 Attribute.type
 Enumeration
 Enumeration.name
 EnumerationLiteral
 EnumerationLiteral.name
 Generalization
DATEX II compliant models may use the following metaclasses and metaattributes from the UML "Extension
Mechanisms” package:
 Tagged Value
 TaggedValue.name
 TaggedValue.dataValue
 Stereotype
 Stereotype.name
DATEX II compliant models may use the following metaclasses and metaattributes from the UML "Data
Types" package:
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 Multiplicity
 Multiplicity.Range
 MultiplicityRange.lower
 MultiplicityRange.upper
DATEX II compliant models may use the following metaclasses and metaattributes from the UML "Model
Management" package:
 Package
 Package.name
Whenever one of these UML constructs is used in a UML model seeking compliance with this Technical
Specification, all provisions contained in this specification governing the use of this particular construct shall
be adhered to.
6.2 Naming conventions
The following conventions apply:
a) The following UML constructs used in this Technical Specification may have a name that is used by the
DATEX II metamodel: AssociationEnd, Attribute, Class, Enumeration, EnumerationLiteral, Package,
Stereotype, TaggedValue. This name is specified via a “name” metaattribute from that the metaclasses
inherit from the abstract Core:ModelElement metaclass.
If such a name metaattribute is provided, it shall begin with a letter, followed by none or more letters or
digits. A name is case sensitive.
In formal terms, a DATEX II name shall comply with the following definition using Extended Backus Naur
Form as of ISO/IEC 14977:1996.
name ::= letter , { letter | digit }
letter ::= “A” | “B” | “C” | “D” | “E” | “F” | “G” | “H” | “I” | “J” | “K” | “L” | “M” | “N” |
“O” | “P” | “Q” | “R” | “S” | “T” | “U” | “V” | “W” | “X” | “Y” | “Z” | “a” | “b” |
“c” | “d” | “e” | “f” | “g” | “h” | “i” | “j” | “k” | “l” | “m” | “n” | “o” | “p” |
“q” | “r” | “s” | “t” | “u” | “v” |
...

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