他还呼吁浏览器厂商一起来为和标签定义标准的规范。
He also makes an appeal for browser makers to come together around a standard codex for the and tags.
最上面的element标签定义了xml作为基本标签。
At the top, the element tag defines the name XML as the base tag.
在这种情况下，扩展点中只有一个可以为这个标签定义一个值。
In this case, however, only one of the extensions should define a value for the label.
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