Compared with the old ones , some improvements are obtained by using this method , such as pattern recognition scope , speed of pattern searching and matching , etc . furthermore , the new algorithm has stronger flexibility and stability . the information acquisition technique of intersected primitive based on combined relationship is provided . with the help of obtained engineering semantics , the correlative projections implying combined relationship among primitives are defined as combined factor 根据已经获取的工程语义，将隐含基元体之间组合关系的相关投影定义为组合因子，由此建立组合关系表，最后借助组合关系表，采用回溯的方法，即从二维的组合因子出发，找出它所隐含的两两基元体在三维空间中的组合关系，进而对该组合关系的主体?基元体的信息进行识别和获取。
In this , content retrieval is achieved by content retrieval testing system based on vector space model , structure information is indexed by relation table through special numbering . we have implemented hybrid retrieval on content , structure and attribute of xml document 其中， xml文档的内容信息检索通过基于向量空间模型的内容检索试验系统来完成，结构信息则通过特定编码，以关系表的方式进行索引，通过将关系数据库与传统信息检索技术的结合，实现了xml文档内容、结构、属性信息的综合检索。
Main contents for studying of the paper is : ( 1 ) analysing the outcome , characteristic and the problem of the hot water supplydesign second flow method in the europe and the usa . ( 2 ) it is determined that value frequenly of different fixture use in the period of using water high peak . ( 3 ) the relation between the n and the hot watersupply design second flow is got by applying program to computer under the different probablity 本课题研究的主要内容为： ( 1 )分析对比欧美主要国家热水设计秒流量计算方法的结果、特点及存在的问题； ( 2 )根据我国居民生活用热水特点，由用水量标准推算出各类型水用户用水高峰期的卫生器具使用概率； ( 3 )编制计算机程序，计算不同使用概率情况下，给水当量与热水设计秒流量的关系表； ( 4 )建立热水设计秒流量q _ g和给水当量n与使用概率p之间的相关关系； ( 5 )绘制《建筑给水排水设计规范》中有关热水设计秒流量计算方法的计算用图表。
The system design includes information model , function design and dada - base logical relation . the information model is established by entity - relation method , and the e - r picture is ploted , and the in - out diagram is gived out ; the fuction designed is established by idef0 method , the subsystems are designed according to the model in detail , we give out the explaining document and explain the calculation method for the model ; we design the data - base logical relation by the above models , decide the distributing and partition the relation diagram of the data - base , then define the logical structure of the diagrams 其中信息建模采用实体-联系的方法建立系统的信息模型，并用idef1x图表示出该信息模型，同时给出电泵物资管理系统输入输出信息表；功能设计用idef _ 0方法建立电泵物资管理系统分系统功能模型，参照功能模型对内部各子系统进行详细设计，给出分系统功能模块的详细说明书及相应功能算法描述；数据库逻辑设计依据系统分析结果、信息模型及功能模型，确定电泵物资管理系统数据库分布，划分数据库内部关系表，定义表的具体逻辑结构。
( 2 ) dtd and xml schema can describes some structural and semantic information of a xml document , which is transformed from a relational table , but it has some limits in describing complex structural and semantic information . to overcome this shortage , a special xml document is defined to describe structural and semantic information of relational table （ 2 ）针对一般情况下，将关系表转换成xml文档时，可用dtd或xmlschema来描述该xml文档结构和语义信息，但对复杂的结构和语义信息仍不能很好地表示的缺点，定义了用来描述关系表结构和语义的特殊xml文档来解决这个问题。
Websphere information integrator can be used to extend the db2 sql api with transparent access to non - ibm relational databases such as oracle or sql server and materialize non - relational data sources like xml streams , message queues , vsam , ims , and so on as relational tables - thereby truly creating a corporate - wide common data model 之类的产品来扩展db2 sql api ，使其可以透明地访问非ibm关系数据库（例如oracle或sql server ） ，通过该产品还可以将非关系数据源（例如xml流、消息队列、 vsam 、 ims等）物化为关系表从而真正创建一个公司级的公共数据模型。
To find proper medium type in chemistry teaching , has investigated the teaching medium choice in five key schools in xian . through statistics and analysis , the author summarized the form of " the chemistry study type and medium effect ' s relation " , thereby gets the reasonable and scientific conclusion of medium type choice in chemistry teaching . it can help chemistry teachers determine 为了寻找化学教学中适宜的媒体类型，本人对西安市的五所重点中学进行了教学媒体选择的调查，通过对调查结果的统计、分析，总结出化学学科的“学习类型媒体效能关系表” ，从而得出化学教学中媒体类型选择的较合理的、科学的结论，帮助化学教师快速方便地根据学习内容、教学目标，确定媒体使用目标，结合各自的教学实际情况，选择适宜的媒体组织教学。
