实际上，原子坐标和表是一些非层次数据，而对于这类数据，xml并非最佳选择。

In fact, the atom coordinates and labels are non-hierarchical data for which XML is not the best choice.

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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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第一，通过在预处理步骤中将原子坐标转换成关系格式来消除原子信息中标记与值的高比例。

First, the high ratio of markup to value in the atom information is eliminated by converting the atom coordinates to relation format in the preprocessing step.

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