1、TOC2022-4-291TOC2022-4-292TOC2022-4-293TOC2022-4-294TOC2022-4-295TOC2022-4-296TOC2022-4-297TOC2022-4-298TOC2022-4-299TOC2022-4-2910TOC2022-4-2911TOC2022-4-2912TOC2022-4-2913TOC2022-4-2914ANDOR计算机通信网络查询语法树的例子TOC2022-4-2915TOC2022-4-2916TOC2022-4-2917TOC2022-4-2918TOC2022-4-2919TOC2022-4-2920TOC2022-4
2、-2921TOC2022-4-2922TOC2022-4-2923TOC2022-4-2924TOC2022-4-2925固定结构超媒体结构层次结构三种主要的文档结构TOC2022-4-2926TOC2022-4-2927TOC2022-4-2928TOC2022-4-2929TOC2022-4-2930TOC2022-4-2931TOC2022-4-2932TOC2022-4-2933TOC2022-4-2934TOC2022-4-2935TOC2022-4-2936TOC2022-4-2937TOC2022-4-2938TOC2022-4-2939njrjDWjnDWjrmWDWDQQTO
3、C2022-4-2940)()|()|(1log)|(1)|(log),(1,RkPRkPRkPRkPwwqdsimiiiijiqijti)|(RkPi)|(RkPiTOC2022-4-29415 . 0)|(RkPiNnRkPii)|(TOC2022-4-2942|)|(,rjriDDRkP|)|(,ririiDNDnRkPTOC2022-4-2943TOC2022-4-2944TOC2022-4-2945TOC2022-4-2946Document RelevanceDocumentContaining Given a query term + - + r n-r n - R-r N-n-
4、R+r N-n R N-R NWhere N is the number of documents seenTOC2022-4-2947NRrnNRrnTOC2022-4-2948TOC2022-4-2949TOC2022-4-2950TOC2022-4-2951TOC2022-4-2952TOC2022-4-2953TOC2022-4-2954Dialog box for chosing sources in old lexis-nexis interfaceTOC2022-4-2955TOC2022-4-2956Supervised (Manual) Category OverviewsT
5、OC2022-4-2957TOC2022-4-2958TOC2022-4-2959TOC2022-4-2960基于表格的查询说明(altavista)TOC2022-4-2961基于表格的查询说明（infoseek）TOC2022-4-2962图形查询接口表示布尔查询的例子TOC2022-4-2963基于菜单方式的查询说明的例子TOC2022-4-2964TOC2022-4-2965用条图表示查询项在文档中出现的情况TOC2022-4-2966Query terms:What roles do they play in retrieved documents?DBMS (Database Sy
6、stems)ReliabilityMainly about both DBMS & reliabilityMainly about DBMS, discusses reliabilityMainly about, say, banking, with a subtopic discussion on DBMS/ReliabilityMainly about high-tech layoffsTOC2022-4-2967TOC2022-4-2968关键词上下文KWIC (Keyword in Context）TOC2022-4-2969文档之间查询项可视化的例子TOC2022-4-2970TOC2022-4-2971TOC2022-4-2972TOC2022-4-2973TOC2022-4-2974TOC2022-4-2975TOC2022-4-2976TOC2022-4-2977TOC2022-4-2978TOC2022-4-2979
