Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Distinguo is a proprietary software application for Semantic search based on description logic that enables users to search for meaning instead of just keywords. This API permits developers to integrate into their applications a tool to parse natural language (generating an XML summary), and then measure the semantic "distance" between a query and a target text. Guha et al. distinguish two major forms of search: Navigational and Research. In navigational search, the user is using the search engine as a navigation tool to navigate to a particular intended document. Semantic Search is not directly applicable to navigational searches.

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