The index database does not need any design elements; it simply contains two types of documents.
索引数据库不需要任何设计元素；它只包含两种类型的文档。
Use models of requirements, design, and database, not just documents
使用需求、设计、数据库模型，而不只使用文档
XML lets you access those design elements and documents. Think of it as your application server, Web server, and database engine rolled into one.
XML允许您访问这些设计元素和文档，可以将它想像成合为一体的应用服务器、Web服务器和数据库引擎。
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