因为XML很冗长，所以存储在XML文档中的数据占据的内存通常比以二进制形式存储的相同数据占据的内存大的多。
Since XML is verbose, data stored in an XML document usually occupies substantially more memory than the same data in binary form.
OVF 规范能够在信封 XML 实例文档中描述单虚拟机内容定义和多虚拟机内容定义。
The OVF specification includes the ability to describe within the envelope XML instance documents single-virtual-machine content definitions, as well as multiple-virtual-machine content definitions.
文档被拆分为“书”，只要您愿意，在帮助系统的一个实例中可以有任意多的书。
Documentation is split into "books," and you can have as many books as you like in one instance of the help system.
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