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CIM Issues #4053

Relax multilplicity of TopologicalNode-TopologicalIsland as

Added by Herbert Falk over 2 years ago.

Status:
Closed
Priority:
Normal
Author/Contact Info:
Kendall Demaree
Base Release:
61970cim15v26
Solution to be Applied To:
61970cim16v15
Solution Version:
CIM16
Solution Applied By:
KLH
Completion Date:
11/28/2012
CIM Keywords:
Breaking Change:
No
Breaking Change Description:
CIM Impacted Groups:
WG13
Requestor:
Standard(s):
Version:
Clause:
Sub-Clause:
Paragraph:
Table:
Originally Closed in Version:
CIM16
Origination Date:
06/24/2011
Origination ID:
13_63
Originally Assigned To:

Description

Relax multilplicity of TopologicalNode-TopologicalIsland association
The present model requires one entry on each side of this. Use cases such as when island has state or history and all its topological nodes go away or are assigned to another island could leave islands with no topological nodes. Similarly, some profiles are desiring to make exchange of island information "optional" so from the TopologicalNode side the island assignment is optional. This also supports the use case where isolated and deenergized buses are not considered to belong to any island.

Proposed Solution

Change the multiplicity of TopologicalNode[1..*]-TopologicalIsland1 to be TopologicalIsland.TopologicalNodes[0..*] and TopologicalNode.TopologicalIsland to be [0..1].

Decision

2012-11-07 WG 13 - Agreed to change the cardinality between TopologicalNode and TopologicalIsland to be 0..1 at the TopologicalIsland (a TopologicalNode doesn't have to be associated with a TopologicalIsland). The cardinality at the TopologicalNode end will remain unchanged. Issue will be closed.

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