Australian Government Architecture Reference Models Version 3.0

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3 Metamodel
3.1 Introduction
The Australian Government Architecture (AGA) Metamodel describes the alignment of agency entities to the
AGA Reference Models.
3.2 Structure
This document is organised into the following sections:
SECTION DESCRIPTION
Metamodel concepts
Metamodel elements by
layer
3.3 Metamodel concepts
Australian Government Architecture Reference Models Version 3.0
Introduces the key concepts of the AGA Metamodel and provides an
overview of the AGA Reference Models.
Describes each metamodel element in detail, including all entity types,
type attributes and relationships. These elements are grouped
logically into layers aligning with the AGA Reference Models.
To understand this document, it is important to be aware of some of the key concepts of enterprise architecture
modelling.
The AGA Metamodel defines the types of information described by the AGA Reference Models. The types of
data the metamodel describes are called entity types. Conceptually, related entity types are grouped into
layers which are described below in Table 1: Description of the AGA Metamodel Layers.
Each entity type contains one or more attributes describing the entity. Further, each entity type may be
conceptually linked to one or more other entity types in a relationship of some kind.
3.3.1 AGA Metamodel layers
Enterprise Architecture frameworks are organised into layers, or perspectives. The Australian Government
Architecture Reference Models define the five layers of enterprise architecture (Performance, Business,
Service, Technical and Data).
This version of the AGA Metamodel outlines the Business, Service and Technical layers. A short description of
these layers is in Table 2-1.
LAYER DESCRIPTION
Performance This will align to the AGA Performance Reference Model (PRM).
Business Describes government initiatives and business processes, aligned to the AGA
Business Reference Model (BRM).