Object Muscat, an Open Source search engine Martin Porter, Richard Boulton Bright Station PLC. A few people in the IR community will already have heard of the Muscat software. It was begun in the early 1980s by Martin Porter, as a generalised and self-contained piece of software for managing computedsed catalogues, and for creating Information Retrieval systems. It was written with library and museum catalogues very much in mind, although it was found to be readily applicable to other kinds of data. Porter had been much influenced by contact with Keith van Rijsbergen and Stephen Robertson, with whom he worked in Cambridge on a two-year research project in 1979-81, and subsequently tried to capture in Muscat a faithful implementation of the probability theory model of IR, which then and subsequently has been so closely linked with Stephen Robertson's name. As a commercial system, Muscat has enjoyed a reasonable success. It is fast, flexible and scalable. It can structure and index documents in a bewildering variety of ways. It will comfortably handle an IR system with a couple of thousand documents, as well as one with over 100 million. To the IR community it has been of interest, but,
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