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Dear MARC list readers, The excerpt below is from "The Power of Prototypes" By Roy Tennant - May 15, 2006 http://www.libraryjournal.com/article/CA6332197.html Thanks to Peter Scott's Library Blog http://xrefer.blogspot.com/ for bringing this article to people's attention. Sincerely - Ian Ian Fairclough Marion (Ohio) Public Library tel. 740-387-0994 x233 [log in to unmask] ____________________________ I recently grabbed about 75,000 MARC records that were conveniently sitting on a work server and wrote a small Perl program to parse out the bits I needed. Using the MapReduce algorithm designed to lessen the complexity of large data sets, I processed that data to write out a file that had all the values for Title, Date, and Subject and which records had those values all in one line per key/value pair. Once I wrote a very simple interface, I had constructed a prototype library catalog faceted browse system in less than a day.