类似于Dictionary和Regularexpression操作器，找到的实体能够映射到数据库表的列，经过进一步处理之后可作为结构化信息使用。
Similar to the Dictionary and Regular Expression operators, the found entities are mapped to database table columns and can be further processed and used like other structured information.
EIDB 中的 INSTANCES 表记录关于实例的信息，DE_INST表维护从每个文档实体到对应的实例的链接。
The INSTANCES table in the EIDB records information about instances, and the DE_INST table maintains the links from each document entity to the corresponding instance.
EIDB 中的 INSTANCES 表记录关于实例的信息，DE_INST表维护从每个文档实体到对应的实例的链接。
The INSTANCES table in the EIDB records information about instances, and the DE_INST table maintains the links from each document entity to the corresponding instance.
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