This method is useful when parsing element-only content; if it encounters non-white-space text before a tag is found (other than comments or processing instructions), it throws an exception.
该方法在解析只含元素的内容时很有用，如果在发现标记之前遇到非空白文本(不包括注释或处理指令)，就会抛出异常。
Start by identifying what's important, and the slowly removing the non-essential things to create the white space.
从划分事情轻重缓急开始，逐渐划掉不重要的事情来留出空间。
Having data sets with a non-white space character separating the data points is a very common occurrence.
最常见的就是数据集合不使用空格字符分隔数据点。
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