A fully relational database schema would require hundreds of tables to represent PDBML.

一个纯关系型的数据库模式将需要数百个表来表示PDBML。

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Such a relational database schema for the PDB was developed in 2005 and is shown in Figure 2.

在 2005 年，曾经为 PDB 开发过这样的一个关系数据库模式，如 图 2 所示。

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So why were the relational database schema center (6) and so many other database-related plug-ins activated?

而为什么关系数据库模式中心(6)和那么多其他数据库相关的插件被激活了？

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