Define and use a structure data type when you need to combine various data types into a single unit , or when none of the elementary data types serve your needs 当您需要将不同的数据类型组合为一个单元时，或者当所有基本数据类型都无法满足您的需求时，可以定义和使用结构数据类型。
This method first clustered web usage data , web content data and web structure data respectively , then provided high - quality recommendation services based on mining results 对web使用数据， web内容数据和web结构数据进行聚类分析，推荐引擎根据挖掘结果向用户提供有效的推荐服务。
Text that contains configuration data or a series of commands usually can be expected to conform to a fairly strict syntax that can be checked before relying on the information in the text 包含结构数据或命令了的文本往往是符合一定的严格的语法规则的，而这些规则在文本的信息中可分析出来的。
A method of using relation mode to express the dynamic hiberarchy data directly is presented by this paper on the basis of analyzing the existing two methods of relation dynamic hiberarchy data 摘要在对现有的两种动态层次结构数据关系化方法分析的基础上，提出了使用关系模式直接表达动态层次结构数据的方法。
Most users at one time or another have dealt with hierarchical data in a sql database and no doubt learned that the management of hierarchical data is not what a relational database is intended for 许多用户时不时都需要在sql数据库中处理分级结构数据，而毫无疑问，关系型数据库并不提供对分级结构数据的管理。
The main research works and specific contributions found in this thesis covers the following aspects : 1 . an appropriate data model for xml - based semistructured data is required before a dbms can be built 本文反映了作者自1999年以来的主要研究成果，包括以下内容：一、在基于xml的半结构数据模型的研究上，首先提出了一种类lisp语言的半结构数据的句法描述形式。
4 this thesis analyses the classification , the data - source storing method of different kinds of tree structures in the product - oriented capp system , and studies the pattern of the constructing trees . puts forward various kinds of function operations of tree structures 研究面向产品capp系统中各种树结构的分类、树结构数据来源的存储方式及树的构建范式；研究树节点各种功能操作的共性点。
Structured mining plays an important role in xml documents mining , web page traffic mining , analysis of molecular evolution , packet routing , biological informatics , biological computing , communication system , image database and city management 结构数据挖掘在xml文档挖掘,网页流量挖掘,生物进化的分析,路由选择,生物信息学,生物计算,通讯系统,图像数据库,城镇规划等诸多领域发挥重要作用。
The product structure info consists in the title bar of the assemble drawing . currently , a number of enterprise product drawings adopt dwg format of autocad , so it needs study to pick up title bar data from the product assemble drawing 产品结构数据信息存在于产品装配图纸的明细栏中，而当前企业的产品图纸大量采用的是autocad的dwg文件，因此需要研究从产品装配图( dwg文件)中提取出明细栏数据的问题。
This idea is not just exciting but practically attainable . this paper first provides an overview of our optimization strategy , andthen focuses on the key implementation issues of our rule - basedtransformation system for xml query optimization in a databaseenvironment Xml的树形结构数据模型与关系模型相比本质上具有更高的复杂性，这使得xml的查询优化空间比关系模型要大许多，从而给xml的查询优化带来了困难。
