Implicitly, the OODBMS has recognized that the query is constrained explicitly by the subtype Employee, and has only selected those objects that fit that criteria for return.
OODBMS识别出查询受到子类型Employee的显式约束，并且只选择了符合返回条件的对象。
The metadata browser displays only the objects and fields that are applicable to the user-selected data operations.
元数据浏览器只显示适用于用户选择的数据操作的对象和字段。
Just selecting multiple objects and changing the value does not work because the property selections apply only to the active object which is only one of those selected.
选择多个对象，不工作，因为属性改变值的活动对象选择只适用于只有一个选择。
Just selecting multiple objects and changing the value does not work because the property selections apply only to the active object which is only one of those selected.
选择多个对象，不工作，因为属性改变值的活动对象选择只适用于只有一个选择。
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