A valid document is required to add a window frame surrounding the portlet content.

为了围绕Portlet内容添加窗口框架，需要使用一个有效的文档。

youdao

You can't take just any data and dump it into a CDATA section and still have a valid document.

您不能将任何数据随意地塞到一个CDATA区域中同时还拥有一个有效的文档。

youdao

An XML-type field contains a complete, well-formed, optionally schema-valid document (or null).

xml类型字段包含一个完整的、格式规范的抑或模式有效的文档(或者为空)。

youdao

Residents must show valid government-issued photo identification, such as a passport, driving licence or consular document.

ECONOMIST: One city devises its own immigration policy