The RDDL document type is defined as a valid XHTML 1.1 module.
RDDL文档类型定义为有效的XHTML 1.1模块。
Before you run the XSLT itself, you need to ensure that the files are valid XHTML.
运行XSLT本身之前，首先要保证文件是有效的XHTML。
Now that you have valid XHTML topics, you can move on to the XSLT calls that migrate your topic.
现在已经得到了有效的XHTML主题，然后可以调用XSLT来迁移主题了。
This migration utility only works with valid XHTML files, so most HTML files must be cleaned up before processing.
该迁移工具只能用于有效的XHTML文件，因此多数HTML 文件都必须在处理之前进行清理。
If you go to the trouble to generate well-formed or even valid XHTML, strict mode is what you plan for and desire.
如果想要生成格式良好甚或是有效的XHTML，则strict模式将会是您计划使用并希望使用的模式。
Whereas previously tags and attributes could be written in uppercase, lowercase, or any combination thereof, a valid XHTML 1.0 document required all tags and attributes to be lowercase.
此前的标签和属性可以是大写、小写，或者任意大小写字母的组合，而有效的XHTML 1.0文档则要求所有标签和属性必须一律小写。
Whereas previously tags and attributes could be written in uppercase, lowercase, or any combination thereof, a valid XHTML 1.0 document required all tags and attributes to be lowercase.
此前的标签和属性可以是大写、小写，或者任意大小写字母的组合，而有效的XHTML 1.0文档则要求所有标签和属性必须一律小写。
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