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They may either be provided as structured
English text and graphical UML diagrams or
by means of the formal language Z [Zintro].

[G.853.1] is a library of information elements
directly defined on the basis of the network
resource types in [G.852.2]. Information ele-
ments for specific management areas are pro-
duced using these as superclasses and defining
specializations with new requirements and ele-
ments.

By convention, new elements are provided with
the community prefix, in the example case,
iptom. Elements defined in [G.853.1] are either
left unprefixed or prefixed G.853.1. The Infor-
mation Viewpoint concepts are illustrated in
Figure 9.

The CPG role has no direct counterpart in
[G.853.1], so a new information object class,
iptomCTPG has been defined.

The relationships are provided with the relation-

ship name, the role names and the role cardinal-

ity. The arrows in Figure 9 point to the informa-

tion objects playing the various relationship

roles.

The Information Viewpoint is the ultimate

source for the definition of information elements

within the system. This is reflected by the

Parameter Matching clause in the Computational

Viewpoint which maps the input and output

parameters to the corresponding information

elements.

The syntax applied when defining elements in

the Information Viewpoint is illustrated by

examples in the following sub-sections.

3.2.2.1 Information Object: Topological Link

(example)

This information type is related to the following

enterprise entity:

Figure 8 Enterprise Viewpoint

• concepts

trail

role

LND

role

SN

role

TL

role

CPG

role

iptom_Caller

role

iptom_Provider

role

manipulate*NR**

• 
  


• 
  


• 
  

  ACTIONS with
  policies

  
  

ACTIVITIES with policies

Community

Policy

Service

Contract

Network Resource (NR) roles

*: manipulate, i.e.,

• create, or


• delete, or


• modify, or


• associate, or


• dis-associate

**: NR (Network Resource), i.e.,

• layerNetworkDomain (LND), or


• subnetwork (SN), or


• topological link (TL), or


• connection point group (CPG), or


• trail

COMMUNITY iptom IP topology management

Community:A composition of Enterprise Objects formed to meet an objective.

Role:Part of the behavior of an Enterprise Object.

Policy:An Obligation, Permission, or Prohibition on an Action,

an Activity or the Community as a whole.

Service Contract:A consistent sub-set of the functionality of an imported community.: