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。

youdao

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。

youdao