元数据注册标准学习笔记

Framwork：

1，重点掌握一个关键的模型：

 

这个模型是之后许多数据转换的方法论基础。

2，主要介绍了元数据注册，以及它在数据语义，数据表达和数据描述的注册当中，所担任的角色。

Classification：

主要介绍了一个Classification Scheme，根据这个scheme。

These classification schemes can be used for classification of: key words, thesauri, taxonomies, and ontologies.

Classification schemes created in conformance with Part 2 support:

1.         Deriving and formulating abstract and application administered items;

2.         Ensuring appropriate attribute and attribute-value inheritance;

3.         Deriving names from a controlled vocabulary;

4.         Disambiguating;

5.         Recognizing super-ordinate, co-ordinate, and sub-ordinate administered item concepts;

6.         Recognizing relationships among administered items;   

7.         Assisting in the development of modularly designed names and definitions.

Registry metamodel and basic attributes：

1，Part 3 specifies the structure and conceptual model of a metadata registry.

 

2，Component parts of an ISO 11179 defined metadata registry include:

1)         Types, Instances and Values

2)         Extensibility

3)         Data References

4)         Metamodel Description

5)         Administration and Identification

6)         Naming and Definition of artifacts

7)         Classification

8)         Conceptual Domain

9)         Value Domain

10)     Physical/Logical Data Domain

A basic set of data element attributes when an entire metadata is not appropriate.

1)         Data Element Concepts

2)         Data Elements

3)         Conceptual Domains

4)         Value Domains

5)         Permissible Values

6)         Value Meanings

Formulation of data definitions：

其实就讲了元数据注册的一些规范：

The guidance in Part 4 focuses on the structure and semantic aspects of definitions. Specific definition rules include the requirement for definitions to:   

1)         Be stated in the singular

2)         State what the concept is, not only what it is not

3)         Be stated as a descriptive phrase or sentence(s)

4)         Contain only commonly understood abbreviations

5)         Be expressed without embedding definitions of other date or underlying concepts

Guidance includes the requirement for data definitions to:

1)         State the essential meaning of the concept

2)         Be precise and unambiguous

3)         Be concise

4)         Be able to stand alone

5)         Be expressed without embedding rationale functional usage or procedural information

6)         Avoid circular reasoning

7)         Use the same terminology and consistent logical structure for related definitions

8)         Be appropriate for the type of metadata item being defined

 

Naming and identification principles：

主要讲了命名规则和细则：

首先是命名必须要满足的要素

The ISO 11179-5 recommendations for naming conventions include requirements to address:

l Scope

l Authority

l Specific Rules

² Semantic Rules – understanding of the data element name

² Syntactic Rules – structure of the data element name

² Lexical Rules – controlled term lists, length, character set, language

² Uniqueness Rules – requirements for uniqueness within specific contexts

其次是具体的命名法则，主要分为三层，分别是Object class, Property and Representation. 这一法则在SAP Global Data Types的命名当中，非常重要。

By way of explanation:   

1)         The “Object Class” is a set of concepts, abstractions or things in the real world that can be identified within clear boundaries and meanings, and whose characteristics and behavior follow the same rules (examples: automobile, person, household, order ...).   

2)         The “Property” is a characteristic feature shared by all the instances of an object class (examples: color, age, income, address ...).   

3)         The “Representation” describes how the data is represented, meaning the data type and its value range (examples: a date can be represented with date or datetime value domains).

细节如图所示：

 

 

Registration：

 

这一部分主要讲的是注册和认证系统的结构。

Part 6 defines how administered items are to be registered through a central registration authority.

It gives instruction for the allocation of unique identifiers for each data item, and provides information about the maintenance of administered items.  

Identifiers consist of three parts – Registration Authority Identifier, Data Identifier, and Version Identifier. Part 6 goes beyond data elements to include registration and administration of data element concepts, conceptual domains, and value domains. 

Part 6 defines a Registration Authority (RA) which functions as principal responsible agency for registration, allocation, and maintenance of administered items.

 

 

文献来源：

1，《ISO/IEC 11179 Documents》

http://isotc.iso.org/livelink/livelink/fetch/2000/2489/Ittf_Home/PubliclyAvailableStandards.htm

2，《Getting started with ISO/IEC 11179》

https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5677057f-0b01-0010-75a7-96794f230eb3