Think of it anytime you require access to some global data for all objects of a single type.

当需要访问单个类型的所有对象的某些全局数据时，请考虑使用此关键字。

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Create a global list with a data type equal to the enumeration name and with a name of Enum_ followed by the enumeration name (in our case, Enum_BookType).

创建一个全局列表，使其数据类型等同于枚举名称，且名称以enum _开头，后接枚举名称(在本例中为Enum_BookType)。

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Note: to use the BOFactory to create a data object, you must define either a complex type or a global element.

请注意：要使用BOFactory创建数据对象，必须定义复杂类型或全局元素。

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George Gero, vice president and precious-metals strategist with RBC Capital Markets Global Futures, is among those traders who monitor the open-interest data on a daily basis for clues on the type of buying or selling that is occurring.

FORBES: Rising Gold Prices, Open Interest Reflects New Buying In July