SIST EN 61970-552:2014
(Main)Energy Management System Application Program Interface (EMS-API) - Part 552: CIM XML Model Exchange Format
Energy Management System Application Program Interface (EMS-API) - Part 552: CIM XML Model Exchange Format
This International Standard specifies a Component Interface Specification (CIS) for Energy Management Systems Application Program Interfaces. This part specifies the format and rules for exchanging modelling information based upon the CIM. It uses the CIM RDF Schema presented in IEC 61970-501 as the meta-model framework for constructing XML documents of power system modelling information. The style of these documents is called CIMXML format.Model exchange by file transfer serves many useful purposes. Profile documents such as IEC 61970-452 and other profiles in the 61970-45x series of standards explain the requirements and use cases that set the context for this work. Though the format can be used for general CIM-based information exchange, specific profiles (or subsets) of the CIM are identified in order to address particular exchange requirements. The initial requirement driving the solidification of this specification is the exchange of transmission network modelling information for power system security coordination. This standard supports a mechanism for software from independent suppliers to produce and consume CIM described modelling information based on a common format. The proposed solution:
• is both machine readable and human readable, although primarily intended for programmatic access,
• can be accessed using any tool that supports the Document Object Model (DOM) and other standard XML application program interfaces,
• is self-describing,
• takes advantage of current World Wide Web Consortium (W3C) recommendations. This document is the Level 2 Component Interface Specification document that describes in narrative terms (with text and examples based on the CIM) the detailed definition of the CIMXML format.
Schnittstelle für Anwendungsprogramme für Netzführungssysteme (EMS-API) - Teil 552: CIM-XML-Modell Austauschformat
Interface de programmation d’application pour système de gestion d'énergie (EMS-API) - Partie 552: Format d’échange de modèle CIM XML
La CEI 61970-552:2013 spécifie une Spécification d'Interface de Composants (Component Interface Specification (CIS)) pour les Interfaces de Programmation d'Application des Systèmes de Gestion d'Énergie. Cette partie spécifie le format et les règles pour échanger les informations de modélisation basées sur le CIM. Elle utilise le Schéma RDF du CIM présenté dans la CEI 61970-501 comme le cadre de métamodèle pour générer les documents XML contenant les informations relatives à la modélisation des réseaux électriques. Le style de ces documents est appelé format CIMXML. La présente norme prend en charge un mécanisme pour les logiciels provenant de fournisseurs indépendants afin de produire et d'utiliser les informations de modélisation décrites dans le CIM dans un format commun.
Sistem za upravljanje energije - aplikacijski programski vmesnik (EMS-API) - 552. del: Format XML za izmenjavo skupnega informacijskega modela (IEC 61970-552:2013)
Ta mednarodni standard določa specifikacije komponent vmesnika (CIS) za aplikacijske programske vmesnike sistema za upravljanje energije. Ta del določa format in pravila za izmenjavo informacij o modeliranju na podlagi skupnega informacijskega modela (CIM). Shemo CIM/RDF, ki je podana v standardu IEC 61970-501, uporablja kot okvir metamodela za izdelavo informativnih dokumentov XML o modeliranju elektroenergetskega sistema. Slog teh dokumentov se imenuje format CIMXML. Izmenjava modelov s prenosom datotek je primerna za številne uporabne namene. Profilni dokumenti, kot so IEC 61970-452 in drugi profili v seriji standardov 61970-45x, pojasnjujejo zahteve in primere uporabe, ki določajo besedilo za to delo. Čeprav se format lahko uporablja za običajno izmenjavo informacij na podlagi modela CIM, so specifični profili (ali podsklopi) CIM-a označeni zaradi posebnih zahtev izmenjave. Začetna zahteva, na kateri je utemeljena ta specifikacija, je izmenjava informacij o modeliranju prek omrežja za prenos signalov za varno delovanje elektroenergetskih sistemov. Ta standard podpira mehanizem programske opreme neodvisnih dobaviteljev za izdelavo in uporabo informacij o modeliranju, opisanih v modulu CIM, na podlagi skupnega formata. Predlagana rešitev:
• omogoča strojno čitljivo obliko in čitljivo obliko, čeprav je prvenstveno namenjena za programski dostop,
• je dostopna z orodji, ki podpirajo model DOM (Document Object Model) in druge standardne aplikacijske programske vmesnike XML,
• je samoopisna,
• izkorišča prednosti trenutnih priporočil Konzorcija za svetovni splet W3C. Ta dokument je dokument za specifikacijo komponent vmesnika 2. stopnje, ki z opisnimi informacijami (z besedilom in primeri na podlagi skupnega informacijskega modula) podrobno določa format CIMXML.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61970-552:2014
01-maj-2014
Sistem za upravljanje energije - aplikacijski programski vmesnik (EMS-API) - 552.
del: Format XML za izmenjavo skupnega informacijskega modela (IEC 61970-
552:2013)
Energy Management System Application Program Interface (EMS-API) - Part 552: CIM
XML Model Exchange Format
Interface de programmation d’application pour système de gestion d'énergie (EMS-API) -
Partie 552: Format d’échange de modèle CIM XML
Ta slovenski standard je istoveten z: EN 61970-552:2014
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN 61970-552:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61970-552:2014
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SIST EN 61970-552:2014
EUROPEAN STANDARD
EN 61970-552
NORME EUROPÉENNE
March 2014
EUROPÄISCHE NORM
ICS 33.200
English version
Energy Management System Application Program Interface (EMS-API) -
Part 552: CIMXML Model Exchange Format
(IEC 61970-552:2013)
Interface de programmation d’application Schnittstelle für Anwendungsprogramme
pour système de gestion d'énergie (EMS- für Netzführungssysteme (EMS-API) -
API) - Teil 552: CIM-XML-Modell
Partie 552: Format d’échange de modèle Austauschformat
CIMXML (IEC 61970-552:2013)
(CEI 61970-552:2013)
This European Standard was approved by CENELEC on 2013-12-03. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61970-552:2014 E
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SIST EN 61970-552:2014
EN 61970-552:2014 - 2 -
Foreword
The text of document 57/1386/FDIS, future edition 1 of IEC 61970-552, prepared by IEC/TC 57,
"Power systems management and associated information exchange" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN 61970-552:2014.
The following dates are fixed:
(dop) 2014-09-21
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-12-03
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61970-552:2013 was approved by CENELEC as a
European Standard without any modification.
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SIST EN 61970-552:2014
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Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60050 Series International Electrotechnical Vocabulary - -
(IEV)
IEC 61968-11 - Application integration at electric utilities - EN 61968-11 -
System interfaces for distribution
management -
Part 11: Common information model (CIM)
extensions for distribution
IEC/TS 61970-2 - Energy management system application CLC/TS 61970-2 -
program interface (EMS-API) -
Part 2: Glossary
IEC 61970-301 - Energy management system application EN 61970-301 -
program interface (EMS-API) - Part 301:
Common information model (CIM) base
IEC 61970-501 - Energy management system application EN 61970-501 -
program interface (EMS-API) -
Part 501: Common Information Model
Resource Description Framework (CIM RDF)
schema
W3C - Document Object Model (DOM) - -
W3C - RDF/XML Syntax Specification - -
W3C - Extensible Markup Language (XML) 1.0 - -
W3C - XSL Transformations (XSLT) - -
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SIST EN 61970-552:2014
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SIST EN 61970-552:2014
IEC 61970-552
®
Edition 1.0 2013-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Energy management system application program interface (EMS-API) –
Part 552: CIMXML Model exchange format
Interface de programmation d’application pour système de gestion d'énergie
(EMS-API) –
Partie 552: Format d’échange de modèle CIMXML
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 33.200 ISBN 978-2-8322-1180-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61970-552:2014
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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions. 7
4 Model exchange header . 9
4.1 General . 9
4.2 CIMXML documents and headers . 9
4.3 Model and header data description . 10
4.4 Work flow . 12
5 Object identification . 13
5.1 URIs as identifiers . 13
5.2 About rdf:ID and rdf:about . 14
5.3 CIMXML element identification . 14
6 CIMXML format rules and conventions . 15
6.1 General . 15
6.2 Simplified RDF syntax . 16
6.2.1 General. 16
6.2.2 Notation . 16
6.2.3 Syntax definition . 16
6.2.4 Syntax extension for difference model . 21
6.3 CIMXML format style guide . 26
6.4 Representing new, deleted and changed objects as CIMXML elements . 27
6.5 CIM RDF schema generation with CIM profile . 27
6.6 CIM extensions . 28
6.7 RDF simplified syntax design rationale . 28
Bibliography . 30
Figure 1 – Model with header . 10
Figure 2 – Example work flow events . 12
Figure 3 – Example work flow events with more dependencies. 13
Figure 4 – CIMXML-based power system model exchange mechanism . 15
Figure 5 – Relations between UML, profile and CIMXML tools . 28
Table 1 – Header attributes . 11
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SIST EN 61970-552:2014
61970-552 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENERGY MANAGEMENT SYSTEM APPLICATION
PROGRAM INTERFACE (EMS-API) –
Part 552: CIMXML Model exchange format
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61970-552 has been prepared by IEC technical committee 57:
Power systems management and associated information exchange.
The text of this standard is based on the following documents:
FDIS Report on voting
57/1386/FDIS 57/1402/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61970 series, published under the general title Energy management
system application program interface (EMS-API), can be found on the IEC website.
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The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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SIST EN 61970-552:2014
61970-552 © IEC:2013 – 5 –
INTRODUCTION
This International standard is part of the IEC 61970 series that define an Application Program
Interface (API) for an Energy Management System (EMS).
IEC 61970-301 specifies a Common Information Model (CIM): a logical view of the physical
aspects of an electric utility operations. The CIM is described using the Unified Modelling
Language (UML), a language used to specify, visualize, and document systems in an object-
oriented manner. UML is an analysis and design language; it is not a programming language.
In order for software programs to use the CIM, it must be transformed into a schema form that
supports a programmable interface.
IEC 61970-501 describes the translation of the CIM in UML form into a machine readable
format as expressed in the Extensible Markup Language (XML) representation of that schema
using the Resource Description Framework (RDF) Schema specification language.
IEC 61970-552 specifies how the CIM RDF schema specified in IEC 61970-501 is used to
exchange power system models using XML (referred to as CIMXML) defined in the 61970-45x
series of profile standards, such as the CIM Transmission Network Model Exchange Profile
described in IEC 61970-452.
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ENERGY MANAGEMENT SYSTEM APPLICATION
PROGRAM INTERFACE (EMS-API) –
Part 552: CIMXML Model exchange format
1 Scope
This International Standard specifies a Component Interface Specification (CIS) for Energy
Management Systems Application Program Interfaces. This part specifies the format and rules
for exchanging modelling information based upon the CIM. It uses the CIM RDF Schema
presented in IEC 61970-501 as the meta-model framework for constructing XML documents of
power system modelling information. The style of these documents is called CIMXML format.
Model exchange by file transfer serves many useful purposes. Profile documents such as
IEC 61970-452 and other profiles in the 61970-45x series of standards explain the
requirements and use cases that set the context for this work. Though the format can be used
for general CIM-based information exchange, specific profiles (or subsets) of the CIM are
identified in order to address particular exchange requirements. The initial requirement driving
the solidification of this specification is the exchange of transmission network modelling
information for power system security coordination.
This standard supports a mechanism for software from independent suppliers to produce and
consume CIM described modelling information based on a common format. The proposed
solution:
• is both machine readable and human readable, although primarily intended for
programmatic access,
• can be accessed using any tool that supports the Document Object Model (DOM) and other
standard XML application program interfaces,
• is self-describing,
• takes advantage of current World Wide Web Consortium (W3C) recommendations.
This document is the Level 2 Component Interface Specification document that describes in
narrative terms (with text and examples based on the CIM) the detailed definition of the
CIMXML format.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
IEC 60050 series, International Electrotechnical Vocabulary
IEC 61968-11, Application integration at electric utilities – System interfaces for distribution
management – Part 11: Common information model (CIM) extensions for distribution
IEC/TS 61970-2, Energy management system application program interface (EMS-API) –
Part 2: Glossary
IEC 61970-301, Energy management system application program interface (EMS-API) – Part
301: Common information model (CIM) base
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SIST EN 61970-552:2014
61970-552 © IEC:2013 – 7 –
IEC 61970-501, Energy management system application program interface (EMS-API) – Part
501: Common Information Model Resource Description Framework (CIM RDF) schema
W3C: RDF/XML Syntax Specification
W3C: Extensible Markup Language (XML) 1.0
W3C: XSL Transformations (XSLT)
W3C: Document Object Model (DOM)
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions contained in
IEC 60050 (for general glossary) and IEC 61970-2 (for EMS-API glossary definitions), as well
as the following apply.
3.1
Application Program Interface
API
set of public functions provided by an executable application component for use by other
executable application components
3.2
Common Information Model
CIM
abstract model that represents all the major objects in an electric utility enterprise typically
contained in an EMS information model
Note 1 to entry: By providing a standard way of representing power system resources as object classes and
attributes, along with their relationships, the CIM facilitates the integration of EMS applications developed
independently by different vendors, between entire EMS systems developed independently, or between an EMS
system and other systems concerned with different aspects of power system operations, such as generation or
distribution management.
3.3
CIMXML
serialisation format for exchange of XML data as defined in this document
3.4
Document Object Model
DOM
platform- and language-neutral interface defined by the World Wide Web Consortium (W3C)
that allows programs and scripts to dynamically access and exchange the content, structure
and style of documents
3.5
Document Type Definition
DTD
standard for describing the vocabulary and syntax associated with an XML document
Note 1 to entry: XML Schema and RDF are other forms that can be used.
3.6
Energy Management System
EMS
computer system comprising a software platform providing basic support services and a set of
applications providing the functionality needed for the effective operation of electrical
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generation and transmission facilities so as to assure adequate security of energy supply at
minimum cost
3.7
Hypertext Markup Language
HTML
mark-up language used to format and present information on the Web
3.8
model
collection of data describing objects or entities real or computed
Note 1 to entry: In the context of CIM the semantics of the data is defined by profiles; refer to 3.9.
Note 2 to entry: In power system analysis, a model is a set of static data describing the power system. Examples of
Models include the Static Network Model, the Topology Solution, and the Network Solution produced by a power
flow or state estimator application.
3.9
profile
schema that defines the structure and semantics of a model that may be exchanged
Note 1 to entry: A Profile is a restricted subset of the more general CIM.
3.10
profile document
collection of profiles intended to be used together for a particular business purpose
3.11
Resource Description Framework
RDF
language recommended by the W3C for expressing metadata that machines can process
simply
Note 1 to entry: RDF uses XML as its encoding syntax.
3.12
RDF Schema
schema specification language expressed using RDF to describe resources and their
properties, including how resources are related to other resources, which is used to specify an
application-specific schema
3.13
Real-World Object
objects that belong to the real world problem domain as distinguished from interface objects
and controller objects within the implementation
Note 1 to entry: The real-world objects for the EMS domain are defined as classes in IEC 61970-301 Common
Information Model.
Note 2 to entry: Classes and objects model what is in a power system that needs to be represented in a common
way to EMS applications. A class is a description of an object found in the real world, such as a PowerTransformer,
GeneratingUnit, or Load that needs to be represented as part of the overall power system model in an EMS. Other
types of objects include things such as schedules and measurements that EMS applications also need to process,
analyze, and store. Such objects need a common representation to achieve the purposes of the EMS-API standard
for plug-compatibility and interoperability. A particular object in a power system with a unique identity is modeled as
an instance of the class to which it belongs.
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3.14
Standard Generalized Markup Language
SGML
international standard for the definition of device-independent, system-independent methods of
representing texts in electronic form
Note 1 to entry: HTML and XML are derived from SGML.
3.15
Unified Modeling Language
UML
object-oriented modeling language and methodology for specifying, visualizing, constructing,
and documenting the artifacts of a system-intensive process
3.16
Uniform Resource Identifier
URI
Web standard syntax and semantic for identifying (referencing) resources (things, such as
files, documents, images).
3.17
eXtensible Markup Language
XML
subset of Standard Generalized Markup Language (SGML), ISO 8879, for putting structured
data in a text file
Note 1 to entry: This is an endorsed recommendation from the W3C. It is license-free, platform-independent and
well-supported by many readily available software tools.
3.18
eXtensible Stylesheet Language
XSL
language for expressing stylesheets for XML documents
4 Model exchange header
4.1 General
Model exchange typically involves the exchange of a collection of documents, each of which
contains instance data (referred to as a model) and a header. The structure and semantics of
each model are described by a profile, which is not included in the exchanged data. The overall
exchange is governed by a collection of profiles in a Profile Document.
A header describes the content of the model contained in a document e.g. the date the model
was created, description etc. The header may also identify other models and their relationship
to the present model. Such information is important when the models are part of a work flow
where, for example, the models have relations to each other, e.g. a model succeeds and/or
depends on another.
Subclauses 4.2 to 4.4 define the model with header data and work flow it is designed to
support.
4.2 CIMXML documents and headers
A CIMXML document is described by a single header. Multiple headers in a CIMXML document
are not allowed. Hence instance data in a CIMXML document adhere to a single profile.
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In case multiple and possibly related CIMXML documents need to be kept together they shall
be collected in an archive, e.g. zip.
4.3 Model and header data description
A description of a model is attached as header data to the model. Figure 1 describes the model
with header information.
class Header Model
Model
+Depending 0.*
+ created :DateTime
+DependentOn 0.*
+ scenarioTime :DateTime
«Primitive»
+ description :String
URI
+ modelingAuthoritySet :URI [0.1]
+SupersededBy 0.*
{root}
+ profile :URI [1.*]
+ version :String
+Supersedes 0.*
FullModelDocumentElement
+forwardDifferences
Statements
DifferenceModel FullModel
0.1
+reverseDifferences
0.1
IEC 2767/13
Figure 1 – Model with header
In Figure 1 the classes FullModel, DifferenceModel and Statements describe the model data
while the header is described by the classes Model and Description. The following is a bottom
up description of these classes:
• The FullModelDocumentElement class represents any of the elements that may appear in a
full model document. It has the two sub types Statements or FullModel, both are further
described below. A full model document typically contains one FullModel element and one
set of Definition elements.
• The Statements class represent a set of Definition (refer to 6.2.3.5) and/or Description
(refer to 6.2.3.6) elements.
• The FullModel (refer to 6.2.3.4) class represent the full model header and its contents is
described by the Model class.
• The DifferenceModel (refer to 6.2.4.6) class represents the difference model header. The
content is described by the Model class, the association role forwardDifferences and
association role reverseDifferences. Both association roles may have one set of
Statements.
• The Model class describes the header content that is the same for the FullModel and the
DifferenceModel. A Model is identified by an rdf:about attribute. The rdf:about attribute
uniquely describe the model and not the document where the header exists. Hence multiple
documents created from the same unchanged data model will have the same rdf:about.
This also means that a model change result in a new rdf:about next time a document is
created.
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The Model class attributes are described in Table 1.
Table 1 – Header attributes
Class Attribute Description
Model created The date when the model was created (note this is typically not when the
CIMXML document was created which is after this time).
Model scenarioTime The date and time that the model represents, e.g. the current time for an
operational model, a historical model or a future planned model.
Model description A description of the model, .e.g. the name of person that created the
model and for what purpose.
Model modelingAuthoritySet A URN describing the equipment model sourcing the
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