This may be necessary because there may be multiple linked records that satisfy the highest priority selection criteria, for a given field.
这可能是必需的，因为对于给定的字段，可能有多个链接的记录满足最高优先级选择标准。
How can multiple implementation classes be selected dynamically based on a variety of run-time selection criteria?
如何根据各种运行时选择标准动态地选择多个实现类？
The EXTRACT function is designed for situations where the results set expects to find multiple objects that meet the selection criteria.
EXTRACT 函数用于生成包含满足选择条件的多个对象的结果集。
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