All empty elements must use the XML empty tag syntax with a trailing forward slash before the endbracket (for example, becomes).
所有空元素必须使用xml空标记语法,在右括号前有一个结尾的正斜杠(例如,becomes)。
3
Note: Start and end tags that are missing a critical character in their formation, such as a closing Angle bracket or a mismatched attribute value quotation mark are not complete.