An equality (sometimes referred to as a value) index is a type of LDAP Indexes which is used to efficiently identify which entries are exactly equal to a given assertion value.

Typically, an equality index may only be maintained for attributes that have a corresponding equality 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 equal to that normalized value.

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