The protocol sequence ID table consists a boolean field to reflect if a given protocol sequence is supported or not.

协议序列 ID 表包含一个布尔字段，表示是否支持给定的协议序列。

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To use a table subquery, you need to use an SQL operator to combine the embedded query with a Boolean expression.

要使用表子查询，需要使用SQL操作符将嵌入式查询与布尔表达式组合在一起。

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If the element is contained in the keys table, a Boolean is set to catch the element data in the characters method.

如果在键表中包含该元素，则布尔值设置成获取characters方法中的元素数据。

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