Knowledge Representation Architecture for Context Interchannge Mediation Fixed
Knowledge Representation Architecture for Context Interchannge Mediation Fixed
Allen Moulton
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Price requires a percent with fraction in 32nds; A. Price is expressed as a percent with decimal fraction. Failure to convert from decimal to 32nds could result in a substantial error in the price. Having identified the semantic conflicts, the mediator inserts appropriate data conversions: multiplying by 100 to convert factor to percent, the Excel "dollarfr" function to convert a decimal fraction into 32nds, and a wrapped date conversion function, source F: Source F (wrapped date conversion fun...ction) attribute sample data semantic notes out 02/01/2012 reformatted date output outformat "mm/dd/yyyy" format for output date in 40940 date input intormat "Lotus" format for input date The query rewritten in terms of the source schema with necessary data representation conversions would be: SELECT cusip as secidn, v. Out as matdat, coupon'100 as cprate. Dollarfr(price, 32) as price FROM A, F WHERE AND F outformat = "mm/dd/yyyy" AND Fin = maturity AND F. Informat = "Lotus" 2. 2 Derived data and multiple source integration The use of XML simplifies the access to data in many respects, but still leaves a wide range of semantic issues to be resolved.
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