opening g tag 开始标记
This is called every time an opening tag is encountered in the XML document.
在 XML 文档中每次遇到开始标记时都会调用它。
To make this well-formed, you would need to switch either the opening tag order or the closing tag order.
要使之格式良好,要么切换开始标记顺序,要么切换结束标记顺序。
It generates two events for each price-quote element: one event for the opening tag and one event for the closing tag.
它为每个price - quote元素生成两个事件:一个开始标记事件和一个结束标记事件。
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