在阐述了XML编码方案的概念和技术的基础上，结合行业当前实际使用的情况，对几种主要的XML节点编码方案从主要思想、原理、功能特点和优缺点方面做了基本的介绍。能让读者对XML数据编码方案有全面的了解，从而为研究XML查询提供了基础。

On the base of explaining the XML encoding scheme of the basic concepts and technologies， this paper introduces several major coding schemes of XML node from the main idea， principle， features， advantages and disadvantages， combined with the actual use of the current industry situation． It allows readers have a full understanding of XML data coding schemes so as to help for XML query research．