Whether it's a document, a photo, a video, a group survey, or a web page, email wasn't designed to incorporate interactivity or richness within the body of the message itself.
不论是文档、照片、视频、调查问卷，还是网页，容纳这类交互信息以及各种格式的内容，并不在电子邮件的功能设计之中。
In other words, for the video application example, if you have detailed information about the director (beyond the director's name), its okay to consider keeping it in a separate XML document.
换句话说，对于这个视频应用程序示例，如果您拥有导演的详细信息(不仅仅是导演姓名)，可以考虑将这些信息保存在一个单独的XML文档中。
The data is the actual thing being stored, such as a PDF file, Word document, a video file, etc.
数据是要实际存储的东西，比如pdf文件、Word文档、视频文件等。
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