XML精确度指的是数据库中保存的是XML数据的原始版本，而不是从保存XML数据的关系表大致重构的版本。
XML fidelity means that the original unchanged version of the XML data is retained in the database instead of approximately reconstructed from relational tables that are used to hold the XML data.
设计新数据库的物理布局应当从设计表空间的组织开始，步骤如下。
Start designing the physical layout of a new database by designing the table space organization, as shown in the following steps.
也可以使用Import按钮从数据库中的现有表导入列。
Columns may also be imported from existing tables in the database using the import button.
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