这种格式很简洁，保留了以前格式的所有信息，还保留了结构，而且仍然足够灵活，可以处理半结构化数据。
This format is simple, concise, retains all the information of earlier formats, retains structure well, yet it is still flexible enough for the semi-structured data.
再详细讨论使用XML的细节之前，首先给您一句忠告：XML不是一种简洁、快速和节省空间的格式。
Before I get into the details of using XML, a short cautionary word is in order: XML is not a small, fast, space-saving format.
顺便说一下，在此对象上使用PHP print指令将获得与var_dump相同的信息，且格式更为简洁，仅有一行(为可读性起见，本文将其拆分为五行书写)。
The PHP print instruction on this object, incidentally, produces the same information as var_dump in a slightly more compact form, all on one line (which we have split into five for readability).
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