An event group profile object defines a selector string which determines which events belong to this group.
事件组概要对象定义了选择器(selector)字符串来决定哪些事件属于这个组。
The event selector string should be a valid XPath expression that is used by the CEI server to match events.
事件选择器字符串应当是有效的XPath表达，CEI服务器利用它来匹配事件。
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