IEC 62656-3:2015

IEC 62656-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Standardized product ontology register and transfer by spreadsheets –
Part 3: Interface for Common Information Model

Enregistrement d’ontologie de produits normalisés et transfert par tableurs –
Partie 3: Interface pour un modèle d’information commun
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IEC 62656-3 ®
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Standardized product ontology register and transfer by spreadsheets –

Part 3: Interface for Common Information Model

Enregistrement d’ontologie de produits normalisés et transfert par tableurs –

Partie 3: Interface pour un modèle d’information commun

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.040.01; 01.110 ISBN 978-2-8322-2258-4

– 2 – IEC 62656-3:2015 © IEC 2015

CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviations . 11
3.1 Terms and definitions . 11
3.2 Abbreviations . 13
4 Generic rules and principles for the design of CIM interface . 13
4.1 Comparative analysis of the structures and functionalities of POM and CIM . 13
4.2 CIM standard series . 14
5 Rules of transformation from CIM to POM . 15
5.1 General rules . 15
5.2 CIM Class . 16
5.2.1 General . 16
5.2.2 Name . 17
5.2.3 Description . 17
5.2.4 Generalization-specialization . 17
5.3 CIM class attributes . 18
5.3.1 General . 18
5.3.2 Name . 18
5.3.3 Native attribute . 18
5.3.4 Type . 18
5.3.5 Description . 18
5.4 CIM association . 19
5.4.1 General . 19
5.4.2 CIM association end structure. 19
5.4.3 General transformation rule for association . 20
5.4.4 General transformation rule for association end . 20
5.5 CIM Enumeration class . 24
5.5.1 General . 24
5.5.2 Name . 25
5.5.3 Description . 25
5.6 CIM Enumeration Attribute . 25
5.6.1 General . 25
5.6.2 Name . 25
5.6.3 Description . 25
5.7 Data type . 26
5.7.1 CIM basic datatype . 26
5.7.2 CIM named data types . 26
5.8 Package. 28
5.8.1 General . 28
5.8.2 POM relation object . 30
5.8.3 CIM packages described in POM relation. 31
6 CIM description in IEC 62656 format . 33
6.1 General . 33
6.2 Class . 34

6.2.1 General . 34
6.2.2 Code . 34
6.2.3 Version number . 34
6.2.4 Revision number . 35
6.2.5 Date of original definition . 35
6.2.6 Date of current version . 35
6.2.7 Preferred name . 35
6.2.8 Short name . 36
6.2.9 Definition . 36
6.2.10 Note . 36
6.2.11 Superclass . 36
6.2.12 Class type . 37
6.2.13 Alternate ID . 37
6.2.14 CIM package . 37
6.2.15 Applicable properties . 38
6.3 Property . 38
6.3.1 General . 38
6.3.2 Property data element type . 38
6.3.3 Definition class . 38
6.3.4 Data type . 39
6.3.5 Applicable relations . 39
6.3.6 Condition . 39
6.3.7 Unit in text . 39
6.3.8 Alternative units . 40
6.4 Data type . 40
6.4.1 General . 40
6.4.2 Definition class . 40
6.4.3 Unit in text . 40
6.4.4 Alternative units . 41
6.4.5 Data type . 41
6.5 Enumeration . 41
6.5.1 General . 41
6.5.2 Definition class . 41
6.5.3 Enumerated list of terms . 41
6.5.4 Enumerate code list . 42
6.6 Term meta-class . 42
6.6.1 General . 42
6.6.2 Preferred letter symbol in text . 42
6.7 Relation . 42
6.7.1 General . 42
6.7.2 Relation type . 43
6.7.3 Domain of the relation . 43
6.7.4 Domain of the function . 43
6.7.5 Codomain of the function . 43
6.7.6 Domain element type . 44
6.7.7 Role of the relation . 44
7 XML schema for updated CIM instances in IEC CDD . 44
7.1 General . 44
7.2 Principles . 45

– 4 – IEC 62656-3:2015 © IEC 2015

8 Version control mechanism in POM for the parcellized CIM . 46
Annex A (normative) Mapping rules from CIM to POM – Mapping rules described in
POM relation meta-class . 47
Annex B (normative) CIM in IEC 62656 format – Normative meta-properties of the
CIM in IEC 62656 model . 56
Annex C (informative) XML Schema for parcellized CIM . 63
C.1 XML schema for POM models . 63
C.2 XML schema for a class . 63
C.2.1 General . 63
C.2.2 class.xsd . 63
C.2.3 class1.xsd . 64
C.2.4 class2.xsd . 64
C.2.5 class3.xsd . 64
C.2.6 class4.xsd . 65
C.3 XML schema for a property . 65
C.3.1 General . 65
C.3.2 property.xsd . 65
C.3.3 property1.xsd . 66
C.3.4 property2.xsd . 66
C.3.5 property3.xsd . 67
C.3.6 property4.xsd . 67
C.4 XML schema for a property derived from an association end . 68
C.4.1 General . 68
C.4.2 association.xsd . 68
C.4.3 association1.xsd . 68
C.4.4 association2.xsd . 69
C.4.5 association3.xsd . 70
C.4.6 association4.xsd . 70
C.5 XML schema for a data type . 70
C.5.1 General . 70
C.5.2 datatype.xsd . 71
C.5.3 datatype1.xsd . 71
C.5.4 datatype2.xsd . 71
C.5.5 datatype3.xsd . 72
C.5.6 datatype4.xsd . 72
C.6 XML schema for an enumeration and its enumerators . 73
C.6.1 General . 73
C.6.2 enum_term.xsd . 73
C.6.3 enum_term1.xsd . 73
C.6.4 enum_term2.xsd . 74
C.6.5 enum_term3.xsd . 74
C.6.6 enum_term4.xsd . 75
C.7 XML schema for a CIM package. 75
C.7.1 General . 75
C.7.2 package.xsd example . 75
C.7.3 package1.xsd example . 76
C.7.4 package2.xsd example . 76
C.7.5 package3.xsd example . 76
C.7.6 package4.xsd example . 77

Annex D (informative) XML examples for parcellized CIM . 78
D.1 XML example for a CIM class with extended attributes . 78
D.2 XML example for a property with extended attributes . 78
D.3 XML example for a CIM association and aggregation with extended
attributes . 79
D.4 XML example for a CIM data type with extended attributes . 81
D.5 XML example for a CIM enumeration and its enumerators with extended
attributes . 81
D.6 XML example for a CIM package with extended attributes . 82
Annex E (informative) Property reference between CIM and IEC CDD – “Power
transformer” definitions in both IEC CDD and CIM . 84
Annex F (informative) Four Layer architecture of UML and POM – Four layer
architecture of MOF (meta object facility) . 87
Annex G (informative) POM Relation usage in IEC 62656-3 . 88
G.1 General . 88
G.2 Meta-model mapping rules between UML and POM(M2) . 88
G.3 UML Association(M1) . 88
G.4 Model level relation definition(M1) . 88
Annex H (informative) Parcellized CIM files access – URL for the parcellized CIM files . 89
Bibliography . 90

Figure 1 – CIM generalization example (from Figure 2 of IEC 61970-301:2013) . 17
Figure 2 – Simple association example (from Figure 3 of IEC 61970-301:2013) . 21
Figure 3 – Aggregation example (from Figure 4 of IEC 61970-301:2013) . 21
Figure 4 – Property data element type definition . 23
Figure 5 – CIM package example (from Figure 1 of IEC 61970-301:2013) . 30
Figure 6 – POM relation model explanation in UML . 31
Figure 7 – Class instances of parcellized CIM . 45
Figure 8 – Conceptual reference mechanism with ID in POM . 46

Table 1 – Mapping of CIM objects and POM objects . 15
Table 2 – Correspondence between a CIM class in UML and a POM class . 17
Table 3 – Mapping of CIM class attribute and POM property . 18
Table 4 – CIM association end structure . 19
Table 5 –CIM associations defined as POM relations . 20
Table 6 – Mapping of CIM association end and POM property . 21
Table 7 – CIM association ends described as POM properties . 22
Table 8 – Mapping of CIM enumeration and POM enumeration . 25
Table 9 – Mapping of CIM enumeration attribute and POM term . 25
Table 10 – Mapping of CIM basic data type and POM simple data type . 26
Table 11 – Mapping of CIM data type and a named data type in POM . 27
Table 12 – Mapping of CIM package and POM relation . 29
Table 13 – CIM package described as POM relation . 32
Table A.1 – Mapping rule from CIM class to POM class . 48
Table A.2 – Mapping rule from CIM class attribute to POM property . 49
Table A.3 – Mapping rule from CIM association to POM relation . 50

– 6 – IEC 62656-3:2015 © IEC 2015

Table A.4 – Mapping rule from CIM association end to POM property . 51
Table A.5 – Mapping rule between CIM enumeration and POM enumeration . 52
Table A.6 – Mapping rule between CIM enumeration attribute and POM term . 52
Table A.7 – Mapping rule between CIM data type and POM data type . 53
Table A.8 – Mapping rule between CIM Package and POM relation . 54
Table A.9 – Mapping rule from POM property to CIM aggregation/association/class
attribute . 55
Table B.1 – Meta-properties for class meta-class . 57
Table B.2 – Meta-properties for property meta-class . 58
Table B.3 –Meta-properties for datatype meta-class . 59
Table B.4 – Meta-properties for enumeration meta-class . 60
Table B.5 – Meta-properties for term meta-class . 61
Table B.6 – Meta-properties for relation meta-class . 62
Table C.1 – POM models and XML schemas. 63
Table E.1 – Native properties of Power transformer class in the IEC CDD . 85
Table E.2 – Native properties of Power transformer class in IEC 61970-301:2013 . 86

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
STANDARDIZED PRODUCT ONTOLOGY REGISTER
AND TRANSFER BY SPREADSHEETS –

Part 3: Interface for Common Information Model

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
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6) All users should ensure that they have the latest edition of this publication.
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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 62656-3 has been prepared by subcommittee 3D, Product
properties and classes and their identification, of IEC technical committee 3: Information
structures, documentation and graphical symbols.
The text of this standard is based on the following documents:
FDIS Report on voting
3D/234/FDIS 3D/245/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.

– 8 – IEC 62656-3:2015 © IEC 2015

A list of all parts in the IEC 62656 series, published under the general title Standardized
product ontology register and transfer by spreadsheets, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
INTRODUCTION
The IEC 62656 series, Standardized product ontology register and transfer by spreadsheets is
a series of International standards that collectively define the methods for transferring and
registering the ontologies of various products and services to and from the ontology registries
and applications based on IEC 61360 / ISO13584 common data dictionary model. The IEC
common data dictionary, or IEC CDD for short, is one of such registries maintained online as
an IEC 61360-4 International Standard based on IEC database procedure stipulated in
ISO/IEC Directives Supplement – Procedures specific to IEC. The IEC CDD is a cross-domain
data dictionary covering all electro-technical products and services, maintained and updated
through a database administered by IEC Central Office.
The common information model originally defined in IEC 61968 and IEC 61970 series of
standards, often called by its short name “CIM” provides a standard way to represent all the
major objects in an electric utility enterprise typically needed to model the operational aspects of a
utility. This model includes public classes and attributes for these objects, as well as the relationships
between them. It is known as an information model for energy management system (EMS) of
power grids and currently is recognized as a standard ontology model for smart grids. An
ontology specification conformant to the CIM data model is available in UML format according
to IEC 61970-301, and in RDF format according to IEC 61970-501.
The IEC 62656 series consists of the following parts, under the general title Standardized
product ontology transfer and register by spreadsheets:
– Part 1: Logical structure for data parcels;
– Part 2: Application guide for use with the IEC common data dictionary (CDD);
– Part 3: Interface for common information model.

– 10 – IEC 62656-3:2015 © IEC 2015

STANDARDIZED PRODUCT ONTOLOGY REGISTER
AND TRANSFER BY SPREADSHEETS –

Part 3: Interface for Common Information Model

1 Scope
This part of IEC 62656 specifies an interface between IEC 62656 series and meta-model for
CIM originally defined in IEC 61968 and IEC 61970 series of standards. The current CIM
includes IEC 62325 series and the interface specified in this part of IEC 62656 also applies to
the model defined in IEC 62325-301:2014. More specifically, this standard defines a formal
mapping between the IEC 62656 and meta-model for CIM in order to import the CIM ontology
into the IEC CDD, and to ensure the interoperability of ontologies of two standards, or even
among a wider spectrum of standards. For the basis of the mapping from CIM to the data
model defined in IEC 62656-1, the UML representation of CIM is referenced.
As a result of the interface specification available from this part of IEC 62656, the smart grid
ontology defined in CIM becomes accessible and interoperable in the midst of ontology pieces
originating in other ontology standards, encompassing material, environmental, and
mechanical, and logistic domains of information. In addition, the specification may also cover
the lifecycle of products.
This part of IEC 62656 also defines methods for transforming the IEC CDD content into the
format defined in IEC 61968 and IEC 61970 series. However, this standard does not intend
any standardization of the elements defined in IEC CDD as part of the CIM ontology, for all
the definitions of IEC CDD are already part of an acknowledged horizontal International
Standard known as IEC 61360-4-DB. Rather it makes the pieces of information stored in IEC
CDD available for further standardization or customization in power electric domains or more
specific user communities as a basic resource, in particular for the purpose of extending the
CIM series of standards.
The data model of this part is based on IEC 62656-1 which specifies the logical structure for a
data parcel, or just simply “parcel,” that is a short name for the medium of registering or
transferring of product ontology. Such a parcel may be typically implemented in a leaf of a
spreadsheet. The data model built on a set of parcels is called “parcellized ontology model”,
which is often abbreviated as “POM” in the remainder of this document.
This part of IEC 62656 specifies:
• the mapping rules and principles for importing CIM UML objects into POM;
• the syntactic and semantic requirements on the parcellized CIM objects;
• the piecewise version control mechanism in POM for the parcellized CIM objects.
The following items are outside the scope of this part of IEC 62656:
• definition of the interface between CIM UML and CIM RDF;
• specification of syntactic and semantic requirements on CIM UML;
• specification of syntactic and semantic requirements on CIM RDF.
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 62656-1:2014, Standardized product ontology register and transfer by spreadsheets –
Part 1: Logical structure for data parcels
IEC 61360-1:2009, Standard data elements types with associated classification scheme for
electric components – Part 1: Definitions – Principles and methods
IEC 61360-4, Standard data element types with associated classification scheme for electric
components – Part 4: IEC reference collection of standard data element types, component
classes and terms, available from
IEC 61968-1:2003, System interfaces for distribution management – Part 1: Interface
architecture and general requirements
IEC 61968-11:2010, System interfaces for distribution management – Part 11: Common
information model (CIM) extensions for distribution
IEC 61970-1:2005, Energy management system application program interface (EMS-API) –
Part 1: Guidelines and general requirements
IEC 61970-2:2004, Energy management system application program interface (EMS-API) –
Part 2: Glossary
IEC 61970-301:2013, Energy management system application program interface (EMS-API) –
Part 301: Common Information Model(CIM) base
IEC 61970-501:2006, Energy management system application program interface(EMS-API) –
Part 501: Common Information Model Resource Description Framework(CIM RDF) schema
IEC 62325-301:2014, Framework for energy market communications – Part 301: Common
information model (CIM) extensions for markets
ISO 639-1:2002, Codes for the representation of names of languages – Part 1: Alpha-2 code
ISO 8601:2004, Data elements and interchange formats – Information interchange –
Representation of dates and times
ISO/IEC Directives Supplement:2013, Procedures specific to IEC
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the terms and definitions given in IEC 61970-2 and
IEC 62656-1, as well as the following apply.
3.1.1
attribute
a) attribute defined in IEC 62656-1, equivalent to a meta-property
b) attribute of class used in IEC 61970-301 corresponding to a property in POM
c) attribute of enumeration used in IEC 61970-301 corresponding to a term in POM
Note 1 to entry: In case of b), it is more specifically called as “CIM attribute” or “CIM class attribute” in this
standard
– 12 – IEC 62656-3:2015 © IEC 2015

3.1.2
aggregationKind
kind of the UML association comprising normal association, aggregation and composition.
Note 1 to entry: Possible value of aggregationKind is “none” for normal association, “shared” for aggregation and
“composition” for a composition, the same as ISO/IEC 19505-2:2012 definitions.
3.1.3
CIM multiplicity at the source
multiplicity of the instances of the class located at the source side of the two classes
connected by an association
3.1.4
CIM basic data type
basic data type defined in the CIM comprising String, Boolean, Float and Integer
Note 1 to entry: In CIM edition, there are other basic data types available for use
3.1.5
CIM object
class, attribute, package, or relationship defined in series of IEC 61970, IEC 61968 and
IEC 62325 series to represent power system resources
3.1.6
CIM package
general-purpose means of grouping related model elements of CIM
Note 1 to entry: CIM Package is a synonymous name assigned to the Segment(MDC_P211) attribute of
IEC 62
...