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DefinitionApproximateIndex
An approximate index is a type of index which is used to efficiently identify which entries are approximately equal to a given assertion value. An approximate index may only be maintained for attributes that have a corresponding approximate matchingRule. That matching rule will be used to normalize values to use as index keys, and the value for that key will be the ID list containing the entry IDs of the entries with values that are approximately equal to that normalized value.

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