An ordering index is a type of [LDAP Indexes] that is used to keep track of the relative order of values for an attribute.  It is very similar to an [equality index|Definition -- Equality Index] except that it uses an ordering [matchingRule] instead of an equality matching rule to [normalize|Definition -- Normalized Value] the values.  Ordering indexes may not be maintained for attributes that do not have a corresponding ordering matching rule.

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