信息技术.数据库语言.结构化询问语言多媒体和应用包.第2部分:全文本

[中文适用范围]： ISO/IEC 13249 本部分： a) 介绍 ISO/IEC 13249 的全文部分（所有部分）； b) 给出 ISO/IEC 13249 本部分所需的参考文献； c) 定义 ISO/IEC 13249 本部分特有的符号和约定； d) 定义 ISO/IEC 13249 本部分特有的概念； e) 定义全文用户定义类型及其关联例程。 ISO/IEC 13249 本部分中定义的全文用户定义类型遵循以下内容。 — 全文用户定义类型对于文本处理是通用的。 它满足使用单词、短语、邻近扩展、模糊扩展和基于同义词库的扩展等模式基于全文数据的各个方面搜索和检索信息的需求。 它还解决了为文本识别设施和文本排名设施构建此类搜索模式的需要。 — 全文用户定义类型不会直接或与其他全文数据类型组合重新定义数据库语言 SQL。 ISO/IEC 13249 这部分的实现可能存在于还支持信息和内容管理、决策支持、数据挖掘和数据仓库系统的环境中。 ISO/IEC 13249 本部分实施所涉及的应用领域包括但不限于图书馆、报纸、多媒体和科学研究应用。 [外文原描述]： ISO/IEC 13249:2003: introduces the Full-Text part of ISO/IEC 13249 (all parts);gives the references necessary for ISO/IEC 13249:2003;defines notations and conventions specific to ISO/IEC 13249:2003;defines concepts specific to ISO/IEC 13249:2003;defines the full-text user-defined types and their associated routines. The full-text user-defined types defined in ISO/IEC 13249:2003 adhere to the following. A full-text user-defined type is generic to text handling. It addresses the need to search and retrieve information based on aspects of full-text data using patterns such as words, phrases, proximity expansion, fuzzy expansion and thesaurus based expansions. It also addresses the need to construct such search patterns for text identification facilities and text ranking facilities.A full-text user-defined type does not redefine the database language SQL directly or in combination with another full-text data type. An implementation of ISO/IEC 13249:2003 may exist in environments that also support information and content management, decision support, data mining and data warehousing systems. Application areas addressed by implementations of ISO/IEC 13249:2003 include, but are not restricted to, library, newspaper, multimedia and scientific research applications.