Consistent description of the elements based on defined formal criteria
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A wrapper is a container element that is not repeatable and cannot have any attributes other than a language attribute. The description is introduced with "A wrapper ...".
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A set is a container element that is (usually) repeatable and can have attributes. The description is introduced with "A set ...".
- An index element is an element that can contain values, often as skos: Concept, that can be included in the indexate as such. Data values should be "Controlled". The description is introduced with "An index element ...".
- A text element is an element that can contain values. Data values should always be "Free text". The description is introduced with "A text element ...".