XML模式的结构规范化研究

关于可扩展标识语言XML的模式规范化研究主要是针对其语义方面,但在实际应用中存在另一类问题:结构规范化。在分析了XML模式设计中结构上存在的两类问题后,提出了XML模式规范化在结构层面上的结构有效性和结构良好性规范。模式的结构有效性确保了XML模式能够被实例化,模式的结构良好性确保了模式定义中的所有元素定义是有意义的,即元素定义都能被实例化。最后,利用元素关系图探讨了结构有效性和结构良好性的判定定理和方法。XML模式的结构规范化是对现有XML模式规范化问题一个有益的补充。

Research on structural normalization of XML schema

Most studies of XML schema was just involved in semantic normalization.The problem of structural normalization was often ignored in practice.First,two kinds of problems in designing XML schema are analyzed,and then the valid structure and well structure in structural level of XML normalization are defined.A valid-structured XML schema guarantees that it can be instanced,and a well-structural XML schema guarantees that all the elements in it are significant.Finally based on the analysis of element relationship graph,a judgment method of valid structure and well structure is put forward and some relative theorems are presented.Structural normalization of XML schema is a significant supplement for the existing studies on XML schema normalization.