Core Architecture Data Model

Core Architecture Data Model  は、エンタープライズアーキテクチャにおいて、アーキテクチャの記述と構築に使われる情報の論理データモデルである。CADMは、本質的にはDepartment_of_Defense_Architecture_Framework内で定義された、共通のスキーマである。元々1997年に、アーキテクチャデータのための論理データモデルとして公表されたものである。

1. 全貌
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Core Architecture Data Model は、標準化された構造でDoDAFアーキテクチャ情報を取り込むために設計された。CADMはDoDAFのデータ要件を支援するため開発された。CADMは、アーキテクチャ記述内及び横断して統合を可能にするDoDAFアーキテクチャデータ要素のためのエンティティと関係性を定義する。このように、CADMは、ミッション領域、コンポーネント、及び連邦と連立パートナー間のアーキテクチャ情報の交換を支援することから、アーキテクチャのデータの相互運用性を促進する。

CADMは、DoDAFに従ってアーキテクチャを統合することを可能になる重要な側面がある。これは、エンティティとオブジェクトの全てのアーキテクチャ記述のため、共通データ要素の定義、セマンティクス、及びデータ構造の利用を含む。CADMの基盤としての使用は、複数ビューを横断する共通オブジェクトと忠実に関係する。現在承認されているバージョンのCADMへの準拠を含めた、そのフレームワークの遵守は、アーキテクチャ開発のための共通アプローチと、関係するアーキテクチャへの基本的基盤の両方を提供する。CADMへの準拠は、共通のアーキテクチャデータ要素の使用を保証する。

2. 歴史
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The CADM was initially published in 1997 as a logical data model for architecture data. It was revised in 1998 to meet all the requirements of the C4ISR Architecture Framework Version 2.0.1 As a logical data model, the initial CADM provided a conceptual view of how architecture information is organized. It identified and defined entities, attributes, and relations. The CADM has evolved since 1998, so that it now has a physical view providing the data types, abbreviated physical names, and domain values that are needed for a database implementation. Because the CADM is also a physical data model, it constitutes a database design and can be used to automatically generate databases.

The CADM v1.01 was released with the DoD Architecture Framework v1.0 in August 2003. This DoDAF version restructured the C4ISR Framework v2.0 to offer guidance, product descriptions, and supplementary information in two volumes and a desk book. It broadened the applicability of architecture tenets and practices to all Mission Areas rather than just the C4ISR community. This document addressed usage, integrated architectures, DoD and Federal policies, value of architecture, architecture measures, DoD decision support processes, development techniques, analytical techniques, and the CADM v1.01, and moved towards a repository-based approach by placing emphasis on architecture data elements that comprise architecture products.

The CADM v1.5 was pre-released with the DoD Architecture Framework, v1.5 in April 2007. The DoDAF v1.5 was an evolution of the DoDAF v1.0 and reflects and leverages the experience that the DoD Components have gained in developing and using architecture descriptions. This transitional version provided additional guidance on how to reflect net-centric concepts within architecture descriptions, includes information on architecture data management and federating architectures through the Department, and incorporates the pre-release CADM v1.5, a simplified model of previous CADM versions that includes net-centric elements. Pre-release CADM v1.5 is also backward compatible with previous CADM versions. Data sets built in accordance with the vocabulary of CADM v1.02/1.03 can be expressed faithfully and completely using the constructs of CADM v1.5.

Note: For DoDAF V2.0, The DoDAF Meta-model  is working to replace the Core Architecture Data Model  which supported previous versions of the DoDAF. DM2 is a data construct that facilitates reader understanding of the use of data within an architecture document. CADM can continue to be used in support of architectures created in previous versions of DoDAF.

3. CADM のトピックス
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3.1. 構築ブロック
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The major elements of a "core architecture data model" are described as follows:

//Core// : The essential elements of architecture information that need to be developed, validated, and maintained and that should be sharable across architecture concerns to achieve architecture goals .
//Architecture Data// : The possible piece-parts of architecture products and related analytical tools in a rigorous definition of the pieces , their properties, features, or attributes, and inter-relationships.
//Data Model//: A data model defines the objects of a domain, their inter-relationships, and their properties, normally for the purpose of a database design. There are three data model levels, from highest to lowest: Conceptual, Logical, and Physical. Conceptual data models are the highest level. They model the user concepts in terms familiar to users. Details may be left out to improve clarity and focus with users. Logical models are more formal, often with considerations of unique data representation , emphasis on semantic well-definedness and exclusivity , and domain-level completeness. Logical data models need not commit to a specific Data Base Management System . Physical data models are usually the most detailed and the level sufficient for database generation. The Physical model must contain all the information necessary for implementation. The Physical model often addresses performance considerations.

3.2. データモデリングと可視化
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The DoDAF incorporates data modeling  and visualization aspects  to support architecture analysis. The DoDAF’s data model, CADM, defines architecture data entities, the relationships between them, and the data entity attributes, essentially specifying the “grammar” for the architecture community. It contains a set of “nouns,” “verbs,” and “adjectives” that, together with the “grammar,” allow one to create “sentences” about architecture artifacts that are consistent with the DoDAF. The CADM is a necessary aspect of the architecture and provides the meaning behind the architectural visual representations . It enables the effective comparing and sharing of architecture data across the enterprise, contributing to the overall usefulness of architectures. The CADM describes the following data model levels in further detail:

//Conceptual// : Models the user concepts in terms familiar to users
//Logical// : More formal model that considers unique data representation, emphasis on semantic well-defineness and exclusivity, and domain-level completeness
//Physical// : Models all the information necessary for database implementationData visualization is a way of graphically or textually representing architecture data to support decision-making analysis. The DoDAF provides products as a way of representing the underlying data in a user-friendly manner. In some cases, the existing DoDAF products are sufficient for representing the required information. Regardless of how one chooses to represent the architecture description, the underlying data  remains consistent, providing a common foundation to which analysis requirements are mapped.

3.3. CADM データモデルのダイアグラム表記
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As illustrated in the figure, boxes represent entities for which architecture data are collected ; they are depicted by open boxes with square corners  or rounded corners . The entity name is outside and on top of the open box. The lines of text inside the box denote the attributes of that entity . The horizontal line in each box separates the primary key attributes  from the non-key descriptive attributes.The symbol with a circle and line underneath indicates subtyping, for which all the entities connected below are non-overlapping subsets of the entity connected at the top of the symbol. Relationships are represented by dotted  and solid  relationships in which the child entity  has zero, one, or many
instances associated to each instance of the parent entity .

3.4. 基本のアーキテクチャ要素
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An architecture data repository responsive to the architecture products of the DoDAF contains information on basic architectural elements such as the following:

//組織的ノード// may be organizations, organization types, and operational  roles. .
//作戦活動// including tasks defined in the Universal Joint Task List .
Information and data refers to information provided by domain databases and other information asset sources  and systems data that implement that information. These information sources and systems data may define information exchanges or details for system interfaces.
Systems nodes refers to nodes associated with physical entities as well as systems and may be facilities, platforms, units,3 or locations.
Systems include families of systems  and systems of systems  and contain software and hardware equipment items.
System functions are required by operational activities and are performed by one or more systems.
Performance refers to performance characteristics of systems, system functions, links , computer networks, and system data exchanges.
Standards are associated with technologies, systems, systems nodes, and data, and refer to technical standards for information processing, information transfer, data, security, and human computer interface.
Technologies include future technologies and relates to systems and emerging standards concerning the use of such technologies.The depicted  relationships shown in this diagram include the following :

Operational nodes perform many operational activities.
Operational nodes require information.
Information are related to systems and implemented as data, which is associated with standards.
Systems perform system functions.
Systems have performance characteristics; both systems and performance may relate to a system function being performed.With these relationships, many types of architectural and related information can be represented such as networks, information flows, information requirements, interfaces, and so forth.

3.5. 関係モデル
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The counterpart to CADM within NASA is the NASA Exploration Information Ontology Model , which is designed to capture and expressively describe the engineering and programmatic data that drives exploration program decisions. NeXIOM is intended to be a repository that can be accessed by various simulation tools and models that need to exchange information and data.

4. 参照
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