Defining cardinality of properties

By default, properties are multivalued, there are no restrictions in the number of values a property can store.

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Wherever this is not desirable, cardinality can be limited on properties through nrl:maxCardinality.

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This will raise an error if the SPARQL updates in the endpoint end up in the property inserted multiple times.

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Tracker does not implement support for other maximum cardinalities than 1.