此类压缩器在编码和解码流程中要求可用XML文档的模式信息。
This class of compressors requires the availability of the schema information of the XML document during their encoding and decoding processes.
如清单10所示，您可以使用一种类似的模式来提取某个特定用户的用户时间线，然后试着在散列表中解码tweet的源代码。
As shown in Listing 10, you use a similar pattern to extract the user timeline for a given user, and then attempt to decode the source of the tweet in a hash.
不要求模式信息的可用性便可实现编码和解码流程(如：xmill、SCMPPM)。
The availability of the schema information is not required to achieve the encoding and decoding processes (for example, XMill, SCMPPM).
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