Pokud je odvozený typ obsahu Empty, měl by být základní typ obsahu také Empty nebo Mixed s vyprázditelnou částicí podle pravidla 5.3 omezení součástí schématu: Derivation Valid (Restriction, Complex).

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If the derived content type is Empty, then the base content type should also be Empty or Mixed with Emptiable particle according to rule 5.3 of Schema Component Constraint: Derivation Valid (Restriction, Complex).

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