Almost all xml processing tools are designed around this fact , and if you break down structured information properly into elements , you ll find that your processing tools complement your design , and that you thereby gain productivity and maintainability 差不多所有的xml处理工具都围绕着这一事实设计，如果能够把结构化信息正确地分解到元素中，您就会发现处理工具可以与您的设计互补，从而提高的生产率并获得了可维护性。
The extensible markup language ( xml ) is a promising standard for describing semi - structured information and contents in the e - business . when xml comes to be a widespread data encoding format for web applications , safeguarding the accuracy of the information represented in xml documents will be indispensable Xml在描述电子商务中的半结构化信息及内容时具有很好的前景，但当xml成为web应用中广泛使用的编码方式时，保证xml描述信息的安全性是必不可少的。
Along with the development of multimedia technology and web technology , the multimedia information including imgae video , audio etc . emerges in a large amount . how to organize , express , manage , inquiry and retrieval those large capacity and unstructural information become the most urgently problem at present 随着多媒体技术和web技术的发展，包括图像、视频、音频等的多媒体信息大量涌现，对这些海量而且包含大量非结构化信息的数据如何组织、表达、管理、查询和检索就成为目前需要迫切研究解决的问题。
Most of the music analysis and music information retrieval ( mir ) researches are based on structural information such as label , midi , or music notes etc . in this thesis we first improve and design a series of algorithms that based on a completely new view of music structure to automate analysis the music structure and label it after a consider comparison and analysis of the related researches before 与音乐分析与检索相关的研究大部分都是基于结构化信息如音乐标签、 midi格式、乐谱等,针对实际音乐内容的分析与检索的研究是最近三四年才出现的。本文针对实际音乐,从一个新的领域? ?音乐结构分析入手,对比分析以往研究的优点与不足,改进和设计一系列的新算法实现了音乐结构自动分析和标注,并以此为基础进一步研究了基于音乐结构的音乐检索和文摘。
With difference from the way that traditional methods perform by accumulating the frequency of keywords . we propose a new metrical function that employs the rs - based entropy by comparing function values to measure the feature of web pages . besides , according to the unstructured and heterogenous characteristics of www , the effect of hypertext tags to keywords " weigh has been taken into account to obtain the most effective keywords for document classification 有别于传统的对关键字频度进行累加的方法，本文提出了基于信息熵的文本关键词测度函数，通过对关键词函数值进行比较，获取对文本分类最具影响性的关键词序列；同时，针对web上异质、非结构化信息的特点，该分类算法还考虑了超文本标记对关键词权值的影响。
Naturally , further layers exist in between , like the virtual file system layer and the actual memory management routines , but regarding managing structured information accessible to users , it makes sense for power users to peer into file system internals and get just a sulfurous whiff of the kernel s infernal recesses 当然，在这两者之间还存在很多层，如虚拟文件系统( vfs )层和实际存储管理例程，但是就管理用户可用的结构化信息而言，超级用户看一下系统内部，并对内核的最深处有一些了解是很有意义的。
The combination of the subtree - based storage model with the document - based to ensure the efficiency and integrality of the data retrieval for all sorts of heterogeneous and context mixed data to the fullest extent ; 2 . dynamically branching and merging combined with the data mapping mechanism , supports the xml document efficiently and can improve the operation capability of the system to some extent ; 3 . referring to the characteristic of xquery , it presents a new operation language for xml data , xqul , which supports the query operation as well as the update operation on xml ; 4 本文提出了一套较为通用的非结构化信息的nativexml文档存储访问策略和实现方案作为对非结构化信息存取机制研究的探索和尝试,主要包括下列理论及技术: 1 .基于子树和基于文档的存储模式相结合,以最大程度保证底层各类形式异构和内容混杂的数据存取的有效性和完整性; 2 .动态分枝合成技术和数据映像机制的引入,实现对xml文档的有效支持,并在一定程度上提高系统处理性能; 3 .结合xquery查询语言特点,提出一种新型xml数据操作语言xqul ,支持xml数据的查询以及更新操作; 4 .三种索引(文档索引、结构索引、值索引)的建立,为xml数据提供从站点到文档,从文档到元素的多级访问策略。
