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引用次数: 14

摘要

在我们对叠加信息管理的研究中,我们开发了一些应用程序,在这些应用程序中,叠加层中的信息元素用于注释、评论、重组和组合来自基础层中一个或多个现有文档的选择。基本文档往往是非结构化或半结构化的(HTML页面、Excel电子表格等),用标记分隔选择。可以通过标记以编程方式访问基础层中的选择,以检索内容和上下文。到目前为止,我们构建的应用程序允许创建新的标记和新的叠加元素(使用标记),但是它们都是面向浏览器的,并且倾向于暴露叠加层和基础层之间的界限。在这里,我们提出了一种新的访问功能,称为双层查询,它允许应用程序或用户作为一个整体在两层上进行查询。双层查询提供了一种数据集成的替代样式,其中只中介基本文档的相关部分(而不是整个文档),并且叠加层可以添加基础层中不存在的信息。我们讨论了用于叠加信息管理的框架,一个带有XML query接口的双层查询系统的初始实现,并提出了改进可伸缩性和性能的机制。
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Querying bi-level information
In our research on superimposed information management, we have developed applications where information elements in the superimposed layer serve to annotate, comment, restructure, and combine selections from one or more existing documents in the base layer. Base documents tend to be unstructured or semi-structured (HTML pages, Excel spreadsheets, and so on) with marks delimiting selections. Selections in the base layer can be programmatically accessed via marks to retrieve content and context. The applications we have built to date allow creation of new marks and new superimposed elements (that use marks), but they have been browse-oriented and tend to expose the line between superimposed and base layers. Here, we present a new access capability, called bi-level queries, that allows an application or user to query over both layers as a whole. Bi-level queries provide an alternative style of data integration where only relevant portions of a base document are mediated (not the whole document) and the superimposed layer can add information not present in the base layer. We discuss our framework for superimposed information management, an initial implementation of a bi-level query system with an XML Query interface, and suggest mechanisms to improve scalability and performance.
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