带有冒号的 XML 语法是什么意思? [英] What does the XML syntax with a colon mean?

问题描述

做什么:

<rd:...>  </rd:.....>

XML格式的RDL文件是什么意思和用途呢?任何人请向我解释一下.我刚开始学习这个.

in XML format of RDL file mean and the purpose of it? Anyone please explain it to me. I just started learning this.

推荐答案

XML 语法 rd: 是命名空间前缀，是命名空间 URI 的缩写.

The XML syntax, rd:, is a namespace prefix, an abbreviation for a namespace URI.

第 1 节，动机中清楚地解释了 XML 命名空间的用途W3C 建议:XML 1.0 中的命名空间(第三版)的摘要:

我们设想了可扩展标记语言 (XML) 的应用，其中单个 XML 文档可能包含元素和属性(这里指to 作为标记词汇")，为多个定义和使用软件模块.这样做的一个动机是模块化:如果这样一个存在易于理解的标记词汇是有用的软件，最好重复使用这个标记而不是重新发明它.

We envision applications of Extensible Markup Language (XML) where a single XML document may contain elements and attributes (here referred to as a "markup vocabulary") that are defined for and used by multiple software modules. One motivation for this is modularity: if such a markup vocabulary exists which is well-understood and for which there is useful software available, it is better to re-use this markup rather than re-invent it.

此类包含多个标记词汇表的文档会带来问题的识别和碰撞.软件模块需要能够识别它们的设计元素和属性过程，即使面对标记时发生的冲突"用于某些其他软件包使用相同的元素名称或属性名.

Such documents, containing multiple markup vocabularies, pose problems of recognition and collision. Software modules need to be able to recognize the elements and attributes which they are designed to process, even in the face of "collisions" occurring when markup intended for some other software package uses the same element name or attribute name.

这些考虑要求文档结构应该具有名称的构造是为了避免不同名称之间的冲突标记词汇.本规范描述了一种机制，XML命名空间，通过分配扩展名到元素和属性.

These considerations require that document constructs should have names constructed so as to avoid clashes between names from different markup vocabularies. This specification describes a mechanism, XML namespaces, which accomplishes this by assigning expanded names to elements and attributes.

因此，在 RDL 中与在其他标准工作中一样，命名空间允许创建词汇表，而不必担心与其他词汇表的命名冲突.

So, in RDL as with in other standards efforts, namespaces allow the creation of a vocabulary without worry of naming collisions with other vocabularies.

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