这种XML压缩器是与XML无关的，也就是说，它们将XML文档用作普通的纯文本文件，因此采用的是传统的文本压缩技术。
This group of XML compressors is XML-blind, that is, they treat XML documents as usual plain text documents and thus apply the traditional text compression techniques.
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.
根据其对XML文档结构的感知对XML压缩器进行分类的示意图。
Diagram of classification of XML compressors according to their awareness of the structure of XML documents.
图7说明了压缩xml文档(tpc . xml，大小为282KB)的效果，使用XMill压缩器，其中输出压缩文件(tpc . xmi，大小为41 KB)的大小代表15%原始xml文件的大小。
Figure 7 illustrates the effect of compressing an XML document tpc.xml, size of 282 KB using the XMill compressor where the output compressed file tpc.xmi.
这类压缩器主要侧重于避免在查询过程中进行完整的文档解压缩。
The main focus of this group, however, is to avoid full document decompression during query execution.
这种压缩器旨在利用对XML文档结构的感知，实现比一般文本压缩器更好的压缩比率。
This group of compressors is designed to take advantage of the awareness of the XML document structure to achieve better compression ratios over general text compressors.
只有使用此类压缩器来压缩带有预定义模式的XML文档时，这类压缩器才是有效的。
This type of compressor can be effective only when it is used to compress XML documents with predefined schemas.
只有使用此类压缩器来压缩带有预定义模式的XML文档时，这类压缩器才是有效的。
This type of compressor can be effective only when it is used to compress XML documents with predefined schemas.
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