URL是一个标识符，不指向网页。
URL统一资源定位符(URL)是一个标识符，指定所标识资源的可用位置以及检索该资源的机制，例如网页的address。
URL a Uniform resource Locator (URL) is an identifier that specifies where an identified resource is available and the mechanism for retrieving it such as the address of a web page.
与网页获取区中的元素对应的名称或数字标识符。
Names or numeric identifiers that correspond to elements in a Web Capture.
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