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. In Research Search, the user enters a phrase which is intended to denote the object of the research. The user will not know in advance which particular documents will contain the information; the task is to locate any number of documents which together will produce the sought information.