You rarely refer to a document by using its index value in the documents collection because this value can change for a given document as other documents are opened and closed 集合中的索引值引用文档，这是因为给定文档的索引值会随其他文档的打开和关闭而发生变化。
The purchasing & cataloguing department of library , which is responsible for document collection and cataloguing , shall make full use of modem technology to realize automation 图书馆采编部作为文献信息的搜集、整理、加工的业务职能部门，任何一项工作都应努力实现自动化、网络化，充分发挥现代信息技术的优势。
Through using the research methods of document collection , comparative analysis , questionnaire and field survey , statistic analysis , qualitative and quantitative analysis , this thesis has made an in - depth and systematic study on the development of vacation tourism product of forest parks 本文采用文献收集法、比较分析法、问卷调查与实地考察法、统计分析法和定性与定量研究相结合的方法,对森林公园度假旅游产品开发问题进行了深入、系统的研究。
If a document is viewed as a combination of basis topics , and every basis topic is represented by a related vector , then it can be categorized as belonging to the topic represented by its principal vector . thus , nmf can be used to organize document collections into partitioned structures or clusters directly derived from the nonnegative factors 如果将一篇文档看作是由许多文本主题组合而成,而文本主题与语义空间的特征向量相对应的话,则我们可以直接根据nmf算法所提取的特征向量及相对于特征向量各文档的编码向量将文本集划分成不同的类。
In view of the preliminary study and small scales application , the flat file system is adapted to build a spatial metadata database . we design the interfaces of a metadata engine . according to the characteristics of the user ' s request for metadata , we give a solution on how to create index on xml document collection and to search those metadata records 从预研和小型系统应用的目的出发，系统采用平面文件系统来建立空间元数据库，论文给出了空间元数据库管理引擎的接口设计，并根据对元数据查询特点的分析，详细阐述了对xml文档型空间元数据库建立索引和执行查询的方式和策略。
Combining with the practice of building library collection of our library , this paper discusses the principle of the local document collection of ethnic minority and science experiment management methods , puts forward the importance standpoint of the real object document and some viewpoints for the digitizing of regions of ethnic minority 摘要文章结合本馆藏书建设实践探讨了民族地方文献的采集原则及科学管理方法，提出了实物文献的重要性观点，并就民族地方文献的数字化发表了一些看法。
