中文XML论坛--RDF中关于元数据的理解

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最近在学习RDF过程中总会遇到关于元数据的问题，看了一些资料，不是能很清楚的理解它，请问元数据到底是个什么（举个例子）

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如果实在理解困难，不如先把它看成一个表格的表头，表头的数据即“元”数据
有了这个基础在看资料深入理解方便些

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Metadata (meta data, or sometimes metainformation) is "data about other data", of any sort in any media. An item of metadata may describe an individual datum, or content item, or a collection of data including multiple content items and hierarchical levels, for example a database schema. In data processing, metadata is definitional data that provides information about or documentation of other data managed within an application or environment. The term should be used with caution as all data is about something, and is therefore metadata.

For example, metadata would document data about data elements or attributes, (name, size, data type, etc) and data about records or data structures (length, fields, columns, etc) and data about data (where it is located, how it is associated, ownership, etc.). Metadata may include descriptive information about the context, quality and condition, or characteristics of the data. It may be recorded with high or low granularity.

Difference between data and metadata

Usually it is not possible to distinguish between (plain) data and metadata because:

* Something can be data and metadata at the same time. The headline of an article is both its title (metadata) and part of its text (data).
* Data and metadata can change their roles. A poem, as such, would be regarded as data, but if there is a song that uses it as lyrics, the whole poem could be attached to an audio file of the song as metadata. Thus, the labeling depends on the point of view.

These considerations apply no matter which of the above definitions is considered, except where explicit markup is used to denote what is data and what is metadata.

http://en.wikipedia.org/wiki/Metadata

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信息检索的一个基本概念，意思是表示数据的数据。
我最初看到这个词（英文）时还没把它和“元数据”联系在一起：）
看的东西多了自然就熟悉了，楼上管理员同志已经把它的英文解释给出来了。如果英语没什么障碍的话建议仔细阅读，就连元数据和普通数据的区别也提到了呢。

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那按照版主的说法，关于元数据可不可以这样理解啊
用来描述组成另一个数据的子元素的数据就算是元数据呢


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