这种类型定义引用了数据库域之中的单元，所以您必须为数据库域，从代码清单4向xsd添加名字域声明以及导入声明。
This type definition refers to a unit in the database domain, so you must add the namespace declaration and the import declaration for the database domain from Listing 4 to your XSD.
当对这种类型的升级使用多个单元时，需要考虑其他数据库更新策略，因为在生产中运行的单元将不会识别新的数据库架构。
Additional database update strategies need to be considered when using more than one cell for this type of update, because the cell running in production will not be aware of the new database schema.
一般来说，在你的单元库中相同类型的最大宽度标准单元不应超过最小标准单元宽度的5到6倍。
In general, the width of the largest standard cells should be no more than five or six times the width of smallest standard cell of the same type in your library.
您也可以建立一个空的资料库单元测试，稍后再新增程序码以测试其他类型的资料库专案。
You can also create an empty database unit test and add code later to test other types of database objects.
您也可以建立一个空的资料库单元测试，稍后再新增程序码以测试其他类型的资料库专案。
You can also create an empty database unit test and add code later to test other types of database objects.
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