Если производный тип содержимого — Empty, то базовый тип содержимого тоже должен быть Empty или Mixed с частью Emptiable в соответствии с правилом 5.3 из Schema Component Constraint: 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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