图 书 馆
排序语义Web查询的近似答案Ranking Approximate Answers to Semantic Web Queries |
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| 课程网址: | http://videolectures.net/eswc09_poulovassilis_raats/ |
| 主讲教师: | Alexandra Poulovassilis |
| 开课单位: | 伦敦大学学院 |
| 开课时间: | 2009-07-28 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | We consider the problem of a user querying semistructured data such as RDF without knowing its structure. In these circumstances, it is helpful if the querying system can perform an approximate matching of the user's query to the data and can rank the answers in terms of how closely they match the original query. We show that our approximate matching framework allows us to incorporate RDFS inference rules as well as standard notions of approximation such as edit distance, thereby capturing semantic as well as syntactic approximations. The query language we adopt comprises conjunctions of regular path queries, thus including extensions proposed for SPARQL to allow for querying paths using regular expressions. We provide an incremental query evaluation algorithm which runs in polynomial time and returns answers to the user in ranked order. |
| 关 键 词: | 半结构化数据; 查询系统; 近似匹配框架 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-10-22：chenxin |
| 阅读次数: | 39 |