The report on the hospital mentions such desiderata as a supply of clean laundry 报告中提到该医院需要乾净的洗换物品
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The report on the hospital mentions such desiderata as a supply of clean laundry 报告中提到该医院需要乾净的洗换物品
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We first present a number of desiderata for an xml - based query language , and based on this criterion , we introduce the syntax of a simple core ian - guage for semistructured data and then describe four extensions that have resulted in working prototypes . second , we present the algorithm for computing the result of a regular expression on data graph with cycles , the first - order interpretation of querying language for semistructured data , and explore structural recursion and bisimulation in semistructured data and propose an efficient and systematic way to computing a bisimulation between the two graphs . we also proposed and implemented a web querying system with database features 基于这些准则，对一个简单的半结构数据查询核心语言的语法提出了两方面扩充；给出了计算数据图中正规表达式的算法；对半结构数据查询语言的一阶逻辑描述、结构递归和数据图的双态仿真( bisimulation )等问题进行了研究，提出了一种判定数据图的bisimulation算法；在xml数据查询语言研究的基础上，设计并实现了一种具有数据库查询特性的web查询系统原型。
