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首页> 外文期刊>IEEE Transactions on Knowledge and Data Engineering >Detecting and representing relevant Web deltas in WHOWEDA
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Detecting and representing relevant Web deltas in WHOWEDA

机译:在WHOWEDA中检测并代表相关的Web增量

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摘要

In this paper, we present a mechanism for detecting and representing changes, given the old and new versions of a set of interlinked Web documents, retrieved in response to a user's query. In particular, we show how to detect and represent Web deltas, i.e., changes in the Web documents that are relevant to a user's query in the context of our Web warehousing system called WHOWEDA (Warehouse of Web Data). In WHOWEDA, Web information is materialized views stored in Web tables in the form of Web tuples. These Web tuples, represented as directed graphs, can be manipulated using a set of Web algebraic operators. In this paper, we present a mechanism to detect relevant Web deltas using Web algebraic operators such as the Web join and the outer Web join. Web join is used to detect identical documents residing in two Web tables, whereas, outer Web join, a derivative of Web join, is used to identify dangling Web tuples. We show how to represent these changes using delta Web tables. We develop formal algorithms for the generation of delta Web tables identifying Web documents which have been added, deleted, or modified since the last query.
机译:在本文中,我们给出了一种检测和表示更改的机制,其中给出了响应于用户查询而检索到的一组相互链接的Web文档的旧版本和新版本。特别是,我们展示了如何检测和表示Web增量,即在称为WHOWEDA(Web数据仓库)的Web仓库系统的上下文中与用户查询相关的Web文档中的更改。在WHOWEDA中,Web信息是以Web元组的形式存储在Web表中的实例化视图。这些Web元组(表示为有向图)可以使用一组Web代数运算符进行操作。在本文中,我们提出了一种使用Web代数运算符(例如Web联接和外部Web联接)检测相关Web增量的机制。 Web连接用于检测驻留在两个Web表中的相同文档,而外部Web连接是Web连接的派生形式,用于标识悬挂的Web元组。我们展示了如何使用增量Web表来表示这些更改。我们开发了正式的算法来生成增量Web表,以标识自上次查询以来已添加,删除或修改的Web文档。

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