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【速搜问答】什么是元数据

问答 admin 3周前 (07-13) 37次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

元数据(Metadata),又称中介数据、中继数据,为描述数据的数据,主要是描述数据属性的信息,用来支持如指示存储位置、历史数据、资源查找、文件记录等功能。

Metadata, also known as intermediary data and relay data, is the data that describes the data. It mainly describes the information of data attributes, which is used to support functions such as indicating storage location, historical data, resource search, file record, etc.

元数据(Metadata),又称中介数据、中继数据,为描述数据的数据(data about data),主要是描述数据属性(property)的信息,用来支持如指示存储位置、历史数据、资源查找、文件记录等功能。

Metadata, also known as intermediary data and relay data, is the data about data. It mainly describes the information of data properties, which is used to support such functions as indicating storage location, historical data, resource search, file record, etc.

元数据算是一种电子式目录,为了达到编制目录的目的,必须在描述并收藏数据的内容或特色,进而达成协助数据检索的目的。都柏林核心集(Dublin Core Metadata Initiative,DCMI)是元数据的一种应用,是 1995 年 2 月由国际图书馆电脑中心(OCLC)和美国国家超级计算应用中心(National Center for Supercomputing Applications,NCSA)所联合赞助的研讨会,在邀请 52 位来自图书馆员、电脑专家,共同制定规格,创建一套描述网络上电子文件之特征。

Metadata is a kind of electronic catalog. In order to achieve the purpose of cataloguing, it is necessary to describe and collect the content or characteristics of data, and then to achieve the purpose of assisting data retrieval. The Dublin Core Metadata Initiative (DCMI) is an application of metadata. It was sponsored by OCLC and NCSA in February 1995 Librarians and computer experts worked together to develop a set of specifications to describe the characteristics of electronic documents on the Internet.

元数据是关于数据的组织、数据域及其关系的信息,简言之,元数据就是关于数据的数据。

Metadata is the information about data organization, data domain and its relationship. In short, metadata is about data.

元数据被定义为:描述数据的数据,对数据及信息资源的描述性信息。

Metadata is defined as data describing data and descriptive information of data and information resources.

元数据(Metadata)是描述其它数据的数据(data about other data),或者说是用于提供某种资源的有关信息的结构数据(structured data)。元数据是描述信息资源或数据等对象的数据,其使用目的在于:识别资源;评价资源;追踪资源在使用过程中的变化;实现简单高效地管理大量网络化数据;实现信息资源的有效发现、查找、一体化组织和对使用资源的有效管理。 元数据的基本特点主要有:

Metadata is data about other data, or structured data, which is used to provide information about a resource. Metadata is the data that describes information resources or data and other objects. The purpose of using metadata is to identify resources, evaluate resources, track the changes of resources in the process of using, realize simple and efficient management of a large number of networked data, and realize the effective discovery, search, integrated organization and effective management of using resources. The basic characteristics of metadata are as follows:

a)元数据一经建立,便可共享。元数据的结构和完整性依赖于信息资源的价值和使用环境;元数据的开发与利用环境往往是一个变化的分布式环境;任何一种格式都不可能完全满足不同团体的不同需要;

a) Once established, metadata can be shared. The structure and integrity of metadata depend on the value and use environment of information resources; the development and utilization environment of metadata is often a changing distributed environment; no one format can fully meet the different needs of different groups;

b)元数据首先是一种编码体系。元数据是用来描述数字化信息资源,特别是网络信息资源的编码体系,这导致了元数据和传统数据编码体系的根本区别;元数据的最为重要的特征和功能是为数字化信息资源建立一种机器可理解框架。

b) Metadata is first and foremost a coding system. Metadata is a coding system used to describe digital information resources, especially network information resources, which leads to the fundamental difference between metadata and traditional data coding systems. The most important feature and function of metadata is to establish a machine understandable framework for digital information resources.

元数据体系构建了电子政务的逻辑框架和基本模型,从而决定了电子政务的功能特征、运行模式和系统运行的总体性能。电子政务的运作都基于元数据来实现。其主要作用有:描述功能、整合功能、控制功能和代理功能。

Metadata system constructs the logical framework and basic model of e-government, which determines the functional characteristics, operation mode and overall performance of e-government. The operation of e-government is based on metadata. Its main functions are: description function, integration function, control function and agent function.

由于元数据也是数据,因此可以用类似数据的方法在数据库中进行存储和获取。如果提供数据元的组织同时提供描述数据元的元数据,将会使数据元的使用变得准确而高效。用户在使用数据时可以首先查看其元数据以便能够获取自己所需的信息。

Since metadata is also data, it can be stored and obtained in the database in the way of similar data. If the organization providing data element provides metadata describing data element, it will make the use of data element accurate and efficient. When using data, users can first view its metadata so that they can get the information they need.

数据仓库

data warehouse

在数据仓库领域中,元数据按用途分成技术元数据和业务元数据。首先,元数据能提供基于用户的信息,如记录数据项的业务描述信息的元数据能帮助用户使用数据。其次,元数据能支持系统对数据的管理和维护,如关于数据项存储方法的元数据能支持系统以最有效的方式访问数据。具体来说,在数据仓库系统中,元数据机制主要支持以下五类系统管理功能:

In the field of data warehouse, metadata is divided into Technical Metadata and business metadata. First of all, metadata can provide user based information, such as metadata recording business description information of data items, which can help users use data. Secondly, metadata can support the management and maintenance of data. For example, metadata about the storage method of data items can support the system to access data in the most effective way. Specifically, in the data warehouse system, metadata mechanism mainly supports the following five types of system management functions:

(1)描述哪些数据在数据仓库中;

(1) Describe which data is in the data warehouse;

(2)定义要进入数据仓库中的数据和从数据仓库中产生的数据;

(2) Define the data to enter the data warehouse and the data generated from the data warehouse;

(3)记录根据业务事件发生而随之进行的数据抽取工作时间安排;

(3) Record the work schedule of data extraction based on the occurrence of business events;

(4)记录并检测系统数据一致性的要求和执行情况;

(4) Record and test the requirements and implementation of system data consistency;

(5)衡量数据质量。

(5) Measure data quality.

软件构造

Software architecture

软件构造领域的定义在软件构造领域,元数据被定义为:在程序中不是被加工的对象,而是通过其值的改变来改变程序的行为的数据。它在运行过程中起着以解释方式控制程序行为的作用。在程序的不同位置配置不同值的元数据,就可以得到与原来等价的程序行为。

In the domain of software construction, metadata is defined as the data that changes the behavior of a program by changing its value instead of the processed object. It plays an important role in controlling program behavior in the process of running. By configuring metadata with different values in different places of the program, the program behavior equivalent to the original can be obtained.


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