Mapping the XML type system to the native language type system has two disadvantages.
将XML类型系统映射为原生语言的类型系统有两方面的劣势。
A constraint mechanism can be an XML schema, a type system, or even some custom programming code.
约束机制可以是XML模式、类型系统甚至自定义的程序代码。
The rule and type system changes discussed in the previous section must be applied to the XML rule and type system files in the installed version of the regular expression annotator PEAR.
对于安装的正则表达式注释器 PEAR 版本中的 XML 规则和类型系统文件，必须应用上一节讨论的规则和类型系统修改。
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