XPath crash course note

XPath language What is XPath? [To be supplied.] What is XPath for? [To be supplied.] Why XPath? [To be supplied.] basic concepts & examples: / 根路徑 //  相對路徑，表示選擇文檔中全部知足雙斜線//以後規則的元素(不管層級關係) * 表明任意元素 ， /

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