接下来，数据架构师将这些原子域与物理模型中的物理列关联起来。

The data architect can then associate these atomic domains to physical columns in the physical data model.

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列pdb_id是一个外键，链接了原子坐标与pdbxml表中对应的PDBML文档。

The column pdb_id is the foreign key that links atom coordinates to the corresponding PDBML document in the PDBXML table.

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注意，这个原子域被定义为 DOUBLE，而数据库列（由反向工程决定）的数据类型为 BIGINT。

Note that this atomic domain is defined as DOUBLE, while the data type for the database column (determined using reverse engineering) is a BIGINT.

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