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[UNIQUE_FIELDS = <field> [, <field>]…]
[UNIQUE_RELATIONS = <relation> [, <relation>]…]
The <uniques> definition is optional. It lists the fields and/or relations that form the object type's unique key. Use the <field> value to list one or more unique fields. Use the <relation> value to list one or more unique relations. Either one or both of the <uniques> values can be listed. If both are listed, the UNIQUE_FIELDS must be listed first.
If no unique information is specified for the object, no unique information will be generated in the export file. If the object is a reference and no unique keys are defined or found in the database, an error will be generated.
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