Boolean connectors like and and or are case sensitive.
像AND和OR这样的布尔结构对大小写非常敏感。
Standard Boolean operators are available, such as and, or, xor and not.
可以使用标准的布尔操作符，比如and、or、xor和not。
Do use enumerations if a member would otherwise have two or more Boolean parameters.
如果成员本来有两个或多个布尔参数，则要使用枚举。
Do use enumerations if a member would otherwise have two or more Boolean parameters.
如果成员本来有两个或多个布尔参数，则要使用枚举。
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