以下为句子列表：
英文: Rule 4: Dynamic On-Line Catalog Based on the Relational Model A relational database must provide access to its structure through the same tools that are used to access the data.
中文: 原则4:动态在线编目以关系模型A为基础，关系型数据库必须提供用访问数据相同的工具访问其结构的功能。
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