Given that easy extensibility is a goal for this language, it behooves us to take a moment and think about the design of the language before diving into its implementation.
如果语言的目标是实现简单的扩展性，那么在深入研究实现之前，让我们先花点时间想一想如何设计语言。
Its rules are very straightforward, and it really has very little extensibility — that is, you can't write your own definitions to dictate how the language behaves; you've got to follow its rules.
它的规则很简单，并且事实上，它的可扩展性很小—即，不能编写您自己的定义来表示语言如何动作；您必须遵循其规则。
Extensibility model allows the core XML configuration language to be enhanced by plugin jars.
可扩展性模型令核心XML配置语言可通过JAR插件包扩充。
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