Most of the methods in this class simply describe various aspects of the aggregation, such as data type, title, and description information, to show up in the BIRT Aggregation widget drop-down list.
此类中的大部分方法只是简单描述要在BIRTAggregation Widgets下拉列表中显示的聚合的各个方面，比如数据类型、标题和描述信息。
If the data type of the field is numeric, the field is added to the Values area, with a default aggregation of sum.
如果这个字段的数据类型为数值，那么这个字段就会增加到值区域，形成一个求和的默认集合。
Analysis of the population data from the field by using the method of spacial distribution index indicates that the spacial distribution pattern of eggs was of aggregation type.
用空间分布型指数法对调查数据进行测定，田间卵的空间分布为聚集分布型。
Every aggregation type corresponds to a data structure diagram and an entity relationship model.
每种聚合类型对应一种数据结构图和ER模型。
Every aggregation type corresponds to a data structure diagram and an entity relationship model.
每种聚合类型对应一种数据结构图和ER模型。
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