为了获得较高的性能，采用二进制编码格式。
In order to get high performance, we use binary encoding format.
与字符格式比较起来，二进制编码格式可以在较少的空间储存较多的信息。
Binary formats are often used to store more information in less space than possible in a character format file.
使用 XML 要有代价：与二进制格式相比，编码要花费更长时间，而且经过网络发送时，它更大些。
XML comes with a price: It takes longer to encode than binary formats and is much larger to send across a network.
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