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A match key is a string value generated by applying algorithms (hash functions) to the attribute values in a reference. In the OYSTER engine, algorithms are first applied to selected attribute values then the final match key is formed by concatenating the algorithm outputs in a fixed order. A particular configuration of attributes and hash algorithms comprises a hash-key generator. Figure 21 shows a hash-key generator that selects attributes A, B, and D of an input reference.
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