Make sure to define not only complex type definition, but also the element definition.
确保不仅要定义复杂的类型，还要对元素进行定义。
Listing 6 shows a snippet for a new SQL database system capability, including both the element declaration and type definition.
代码清单6为新的SQL数据库系统功能提供了一个代码片段，包括元素声明与类型定义。
Build element definitions as necessary to reference a single complex type definition.
根据需要构建元素定义，以引用单个复杂类型定义。
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