无环XML文档的研究

Research of Acyclic XML Document

无环数据库有许多优良特性,因此,无环成为判断数据库模式优劣的重要特性。针对以上情况,以关系数据库中无γ环数据库模式为参考,给出XML文档中无XML_γ环的相关定义、表示、特征及无XML_γ环的XML数据模式的设计方法,理论分析证明,所设计的规则是有效的。

Acyclic database has many good characteristics, so acyclic is an important characteristic for database schema. Based on γ acyclic database schema, this paper presents the definitions of none XML y cycle, the characteristics of none XML_ γ cycle in XML documents and design method of XML schema for none XML_γ cycle. Theory analysis proves the effectiveness of the rules designed.