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By default, an attribute of each entry can have many values. You can restrict an an attribute to have only one value within an entry. You do this as part of the syntax specification of the attribute.The attribute is then called a single valued attribute.
Note: The single valued attribute is a characteristic of an attribute within each entry. Do not confuse this with the concept of unique attribute value, which is a run time check that compares the attribute values between different entries, and is not part of the schema.
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