xml - 带有冒号的 XML 语法是什么意思？

Question

做什么:

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

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

Answer 1

XML 语法 rd: 是命名空间前缀，是命名空间 URI 的缩写。

XML 命名空间

XML 命名空间的用途在 Section 1, Motivation and Summary 中有清楚的解释。的 W3C Recommendation: Namespaces in XML 1.0 (Third Edition) :

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.

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.

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，与其他标准工作一样，在 RDL 中，命名空间允许创建词汇表，而不必担心与其他词汇表发生命名冲突。