Energy management system application program interface (EMS-API) - Part 453: Diagram layout profile

IEC 61970-453:2014 is a member of the IEC 61970-450 to 499 series that, taken as a whole, defines, at an abstract level, the content and exchange mechanisms used for data transmitted between control centre components. Included in this part of IEC 61970 are the general use cases for exchange of diagram layout data, and guidelines for linking the layout definitions with CIM data. Guidelines for management of schematic definitions through multiple revisions are also included. This new edition includes the following significant technical change with respect to the previous edition: The SVG elements and its data model have been replaced by the Diagram Layout Package, which is now an integral part of the IEC 61970-301 (CIM) model.

Schnittstelle für Anwendungsprogramme für Netzführungssysteme (EMS-API) - Teil 453: Diagramm Entwurfsprofile

Interface de programmation d'application pour système de gestion d'énergie (EMS-API) - Partie 453: Profil de disposition du diagramme

L'IEC 61970-453:2014 appartient à la série CEI 61970-450 à 499 qui, considérée dans son ensemble, définit à un niveau abstrait le contenu et les mécanismes d'échange utilisés pour les données émises entre les composants du centre de conduite. Sont inclus dans la présente partie de la CEI 61970 les cas d'utilisation généraux pour l'échange de données de disposition du diagramme, et les lignes directrices pour relier les définitions de structure avec des données du CIM. Des lignes directrices pour la gestion des définitions schématiques par le biais de multiples révisions sont également incluses. Cette nouvelle édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: Les éléments SVG et leur modèle de données ont été remplacés par le paquetage DiagramLayout (Disposition du diagramme), qui fait maintenant partie intégrante du modèle de la CEI 61970-301 (CIM).

Aplikacijski programski vmesnik za sistem upravljanja z energijo (EMS-API) - 453. del: Profil razporeditve diagramov

Standard EN IEC 61970-453 je del skupine standardov IEC 61970 od 450 do 499, ki kot celota na abstraktni ravni določa vsebino in mehanizme izmenjave, ki se uporabljajo za podatke, prenesene med komponentami nadzornega centra. V ta del standarda IEC 61970 so vključeni splošni primeri uporabe za izmenjavo podatkov o razporeditvi diagramov in smernice za povezavo definicij razporeditve s podatki CIM. Vključene so tudi smernice za upravljanje shematskih definicij shem prek več revizij.

General Information

Status
Published
Publication Date
19-Jun-2014
Current Stage
6060 - Document made available
Due Date
20-Jun-2014
Completion Date
20-Jun-2014

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SLOVENSKI STANDARD
SIST EN 61970-453:2014
01-september-2014
1DGRPHãþD
SIST EN 61970-453:2008

Aplikacijski programski vmesnik za sistem upravljanja z energijo (EMS-API) - 453.

del: Profil razporeditve diagramov
Energy Management System Application Program Interface (EMS-API) - Part 453:
Diagram Layout Profile

Interface de programmation d'application pour système de gestion d'énergie (EMS-API) -

Partie 453: Profil de disposition du diagramme
Ta slovenski standard je istoveten z: EN 61970-453:2014
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 61970-453:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61970-453:2014
---------------------- Page: 2 ----------------------
SIST EN 61970-453:2014
EUROPEAN STANDARD EN 61970-453
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 33.200 Supersedes EN 61970-453:2008
English Version
Energy management system application program interface
(EMS-API) -
Part 453: Diagram layout profile
(IEC 61970-453:2014)

Interface de programmation d'application pour système de Schnittstelle für Anwendungsprogramme für

gestion d'énergie (EMS-API) - Netzführungssysteme (EMS-API) -

Partie 453: Profil de disposition du diagramme Teil 453: Diagramm Entwurfsprofile

(CEI 61970-453:2014) (IEC 61970-453:2014)

This European Standard was approved by CENELEC on 2014-04-01. 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.
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 61970-453:2014 E
---------------------- Page: 3 ----------------------
SIST EN 61970-453:2014
EN 61970-453:2014 - 2 -
Foreword

The text of document 57/1409/FDIS, future edition 2 of IEC 61970-453, 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 61970-453:2014.
The following dates are fixed:
(dop) 2015-01-01
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-04-01
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61970-453:2008.

EN 61970-453:2014 includes the following significant technical changes with respect to EN 61970-

453:2008:

a) The SVG elements and its data model have been replaced by the Diagram Layout Package, which

is now an integral part of the IEC 61970-301 (CIM) model.

b) The exchange is in accordance with and is a part of the IEC 61970 profile concept.

c) A glue point object has been introduced to model explicit connections between graphics elements.

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 61970-453:2014 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 61968-11 NOTE Harmonised as EN 61968-11.
IEC 61970-1 NOTE Harmonised as EN 61970-1.
IEC/TS 61970-2 NOTE Harmonised as CLC/TS 61970-2.
IEC 61970-452 NOTE Harmonised as EN 61970-452.
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SIST EN 61970-453:2014
- 3 - EN 61970-453:2014
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 - International Electrotechnical Vocabulary - -
(IEV)
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
IEC/TR 62541-1 - OPC unified architecture - CLC/TR 62541-1 -
Part 1: Overview and concepts
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SIST EN 61970-453:2014
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SIST EN 61970-453:2014
IEC 61970-453
Edition 2.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Energy management system application program interface (EMS-API) –
Part 453: Diagram layout profile
Interface de programmation d'application pour système de gestion d'énergie
(EMS-API) –
Partie 453: Profil de disposition de diagramme
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 33.200 ISBN 978-2-8322-1403-9

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
---------------------- Page: 7 ----------------------
SIST EN 61970-453:2014
– 2 – 61970-453 © IEC:2014
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Use Cases ....................................................................................................................... 8

4.1 General use cases for diagram exchange .......................................................... 8

4.2 Simple bay diagram example ........................................................................... 10

5 Diagram layout exchange profile .................................................................................... 12

5.1 General ............................................................................................................ 12

5.2 Diagram layout profile classes ......................................................................... 13

5.2.1 General .......................................................................................... 13

5.2.2 Diagram .......................................................................................... 14

5.2.3 DiagramObject ................................................................................ 14

5.2.4 DiagramObjectGluePoint ................................................................ 15

5.2.5 DiagramObjectPoint ........................................................................ 15

5.2.6 DiagramObjectStyle ........................................................................ 16

5.2.7 TextDiagramObject ......................................................................... 16

5.2.8 VisibilityLayer ................................................................................. 17

5.2.9 Abstract classes – IdentifiedObject ................................................. 17

5.2.10 Enumerations – OrientationKind ..................................................... 18

6 Graphical rendering ....................................................................................................... 18

6.1 General ............................................................................................................ 18

6.2 Single point objects .......................................................................................... 18

6.3 Multiple point objects ....................................................................................... 19

6.4 Gluing points.................................................................................................... 20

6.5 Diagram object style ........................................................................................ 21

6.6 Diagram layout exchange process ................................................................... 21

7 Examples ...................................................................................................................... 23

7.1 Data instantiation and encoding ....................................................................... 23

7.2 Simple bay example use case .......................................................................... 25

Annex A (informative) Benefits and format conversion from IEC 61970-453 Edition 1 to

Edition 2 ............................................................................................................................... 27

Bibliography .......................................................................................................................... 28

Figure 1 – System overview .................................................................................................... 9

Figure 2 – Bay diagram as rendered ..................................................................................... 10

Figure 3 – Bay diagram drawn in GIS style ........................................................................... 11

Figure 4 – Bay diagram drawn in SCADA style...................................................................... 12

Figure 5 – Diagram layout information model ........................................................................ 13

Figure 6 – Conventions used for representing object instances and associations .................. 18

Figure 7 – Single point diagram objects ................................................................................ 19

Figure 8 – Multiple point diagram objects .............................................................................. 20

Figure 9 – Disconnector with glue point ................................................................................ 20

Figure 10 – Disconnector and breaker with glue points ......................................................... 21

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SIST EN 61970-453:2014
61970-453 © IEC:2014 – 3 –

Figure 11 – Profiles within IEC standards ............................................................................. 22

Figure 12 – Disconnector diagram object instantiation .......................................................... 23

Figure 13 – IEC 61970-552 Encoding for disconnector diagram data .................................... 24

Figure 14 – Bay diagram example with objects outlined GIS style ......................................... 25

Figure 15 – Bay diagram example with objects outlined SCADA/EMS style ........................... 26

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SIST EN 61970-453:2014
– 4 – 61970-453 © IEC:2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENERGY MANAGEMENT SYSTEM APPLICATION
PROGRAM INTERFACE (EMS-API) –
Part 453: Diagram layout profile
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

services carried out by independent certification bodies.

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 61970-453 has been prepared by IEC technical committee 57:

Power systems management and associated information exchange.

This second edition cancels and replaces the first edition published in 2008. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) The SVG elements and its data model have been replaced by the Diagram Layout
Package, which is now an integral part of the IEC 61970-301 (CIM) model.

b) The exchange is in accordance with and is a part of the IEC 61970 profile concept.

c) A glue point object has been introduced to model explicit connections between graphics

elements.
---------------------- Page: 10 ----------------------
SIST EN 61970-453:2014
61970-453 © IEC:2014 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
57/1409/FDIS 57/1430/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.

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.
---------------------- Page: 11 ----------------------
SIST EN 61970-453:2014
– 6 – 61970-453 © IEC:2014
INTRODUCTION

This standard is part of the IEC 61970 series that define an application program interface

1 2
(API ) for an Energy Management System (EMS ).

The IEC 61970-3x series specify a Common Information Model (CIM ): a logical view of the

physical aspects of EMS information. The IEC 61970-3x series includes IEC 61970-301,

Common Information Model (CIM) Base.

This standard is one of the IEC 61970-4x series that define utility control centre component

interface specifications (CIS ). IEC 61970-4x specifies the functional requirements for

interfaces that a component (or application) shall implement to exchange information with

other components (or applications) and/or to access publicly available data in a standard way.

The component interfaces describe the specific message contents and services that can be

used by applications for this purpose. The implementation of these messages in a particular

technology is described in the IEC 61970-5x series.
Energy Management Systems employ a variety of schematic and quasi-geographic

presentations in their user interfaces. These are sometimes generated automatically, but

more often are hand-drawn and require considerable labour to create and maintain. Most of

this labour goes into the arrangement, or ‘layout’ of the power system elements within the

overall diagram. When network models are exchanged, as defined in IEC 61970-452 and

IEC 61968-13 standards, it is desirable to be able to exchange these layouts.

IEC 61970-453 specifies guidelines for the exchange of diagram layout information for

schematic data that is encoded using IEC 61970-552.
___________
Footnote 1 applies to the French version only.
Footnote 2 applies to the French version only.
Footnote 3 applies to the French version only.
4 Footnote 4 applies to the French version only.
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SIST EN 61970-453:2014
61970-453 © IEC:2014 – 7 –
ENERGY MANAGEMENT SYSTEM APPLICATION
PROGRAM INTERFACE (EMS-API) –
Part 453: Diagram layout profile
1 Scope

This part of IEC 61970 is a member of the IEC 61970-450 to 499 series that, taken as a

whole, defines, at an abstract level, the content and exchange mechanisms used for data

transmitted between control centre components.

Included in this part of IEC 61970 are the general use cases for exchange of diagram layout

data, and guidelines for linking the layout definitions with CIM data. Guidelines for

management of schematic definitions through multiple revisions are also included.

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, International electrotechnical vocabulary

IEC 61970-301, Energy management system application program interface (EMS-API) –

Part 301: Common information model (CIM) base

IEC 61970-501, Energy management system application program interface (EMS-API) –

Part 501: Common Information Model Resource Description Framework (CIM RDF) schema

IEC/TR 62541-1, OPC Unified Architecture – Part 1: Overview and concepts
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050, as well as

the following, apply.
3.1
domain object
instance of a class that models a Real-World Object with a unique identity

Note 1 to entry: A domain object inherits from a CIM IdentifiedObject. A domain object is normally not a diagram

object.
3.2
diagram
electronic equivalent of a seamless paper plan
___________
Footnote 5 applies only to the French version.
Footnote 6 applies only to the French version.
Footnote 7 applies to the French version only.
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SIST EN 61970-453:2014
– 8 – 61970-453 © IEC:2014

Note 1 to entry: The diagram is an identified container for the diagram objects. Examples of diagrams include

substation schematics, transportation or distribution network orthogonal schematics, or pseudo-geographical

schematics. A diagram has a well-defined coordinate space.
3.3
diagram object
representation of domain objects or static background
Note 1 to entry: The diagram is composed of diagram objects.

Note 2 to entry: An example for domain objects includes breakers. An example for static background object

includes lakes.
3.4
diagram object style

definition of how to render diagram objects possibly based on the state of domain objects

Note 1 to entry: Typically, the diagram object style is resolved in a very specific way for each system.

4 Use Cases
4.1 General use cases for diagram exchange

Figure 1 shows a high-level view of using diagram layout data exchange with potential

systems that can make use of the diagram layout data.
___________
Footnote 8 applies to the French version only.
---------------------- Page: 14 ----------------------
SIST EN 61970-453:2014
61970-453 © IEC:2014 – 9 –
IEC 0423/14
Figure 1 – System overview

An examination of the use cases for such exchanges revealed that the diagrams being

exchanged are not fixed graphic presentations. Instead the diagrams vary considerably in

appearance as attributes of CIM objects change, and they support important user interaction.

For example, a SCADA one-line in its creator’s system is supporting live control of the power

system, while in a receiver’s system it is merely used for reference so that a neighbour can

understand what the system looks like beyond its own border. These variations are typically

not easy or appropriate to map between the source and receiving systems because of the

degree of difference in the way those systems are designed.

In the specification of diagrams, one common element is that the style of displaying an object

of a certain kind is usually defined once and then re-used, but the placement of objects must

be adjusted whenever new elements are added to the data model. This placement and

maintenance of placement is where most of the labour investment takes place that users

would like to preserve. As a result, this standard is limited to the exchange of diagram layouts

(meaning the arrangement of CIM objects in a display space) rather than a complete

exchange of all characteristics of a graphic presentation.

With this proposed standard, instead of maintaining duplicate schematics for different

applications, the schematics are exported by one system and imported by the other system.

Diagram layout profile is an extension to the CIM power system model exchange IEC 61970-

452, and will be orchestrated along with the existing CIM XML model exchange and updates

provided using the existing CIM XML Incremental file format as defined in IEC 61970-552.

IEC 61970-552 also describes how payload headers provide information as to how payloads

fit together.
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SIST EN 61970-453:2014
– 10 – 61970-453 © IEC:2014

This process can be applied for initial schematics construction as well as for continuous

maintenance.

The importing system can create its graphics displays from the imported data, or the diagram

layout data can serve as additional documentation and means of understanding for the

domain data exchange.
4.2 Simple bay diagram example

Diagrams are constructed using different approaches. This subclause illustrates this using a

simple bay drawing. Figure 2 shows a typical representation of a bay.
IEC 0424/14
Figure 2 – Bay diagram as rendered

In a GIS system, lines are typically drawn up to the centre point of the symbol. This is shown

in Figure 3 (transparent symbol is used for illustration). This construction method is

independent if the symbol size, i.e. the drawing looks “pretty” even when the importing system

used a smaller symbol size than the original one.
---------------------- Page: 16 ----------------------
SIST EN 61970-453:2014
61970-453 © IEC:2014 – 11 –
IEC 0425/14
Figure 3 – Bay diagram drawn in GIS style

In a SCADA system, lines are typically drawn to align with the terminals of the object

represented by the symbol. This is shown in Figure 4 (transparent symbol is used for

illustration). This construction method gives a closer representation of the electrical topology,

but depends on a certain symbol size.
---------------------- Page: 17 ----------------------
SIST EN 61970-453:2014
– 12 – 61970-453 © IEC:2014
IEC 0426/14
Figure 4 – Bay diagram drawn in SCADA style
5 Diagram layout exchange profile
5.1 General
Profile namespace: http://iec.ch/TC57/61970-453/DiagramLayout/2#

This standard specifies an exchange profile for schematics with the following characteristics.

• A generic method for linking the diagram object to the domain data. Domain data and

diagram layout data can be exchanged together with the domain data, or separately from

each other with the assumption that domain data will have already been imported should

diagram layout data be imported separately.

• It does not require or imply a specific domain data format. Therefore, it supports domain

data modelled according to the IEC 61970-301 Common information model (CIM) that is

exchanged in the IEC 61970-501 format (CIM RDF schema). Diagram layout data

references domain data in compliance with IEC/TR 62541-1, OPC Unified Architecture).

• The intended usage of this standard is that the source of a diagram will use the standard

to encode the layout of their diagram as they created it. It is then incumbent upon any

receiver to supply the means of using that diagram layout in their system.

– In the simplest situation, if the source uses Switch object placements, the receiver

creates a generic Switch template in the receiver’s system that will be used to render

Switches (i.e. there is no exchange of Switch templates).

– In more complex situations, a 1:1 correspondence may not be desirable, and receivers

may have to create generic transformations in order to use exchanges.

– However, in both situations, it is expected that once an investment is made in a

strategy for rendering, repeated imports may be carried out automatically.

• Supports the exchange of diagram objects that have no relationship to domain data, i.e.,

pure static background objects.
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SIST EN 61970-453:2014
61970-453 © IEC:2014 – 13 –

• Supports multiple representations of the same domain object in the same or different

diagrams.

• Allows the diagram to be used as the unit of exchange, providing a straightforward

approach to partial exchange, or an exchange between systems that have a separate

model and repository for diagram layout data.

• Supports assignment of diagram objects to layers or other means, for showing or hiding

information based on zoom level and/or user interest.
• A generic method for pro
...

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