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Unique Attribute Values

Sometimes you need the attribute value in an entry to be unique. For example, for email to work each user needs a unique email ID.

You can specify which attributes must have unique values, and you can also specify a subtree within which the specified attribute must have unique values. You can specify different subtrees for different attributes.

If you implement unique attributes, ensure the client applications can handle refusals when they add or modify attribute values that already exist.