Jos johdettu sisältötyyppi on Empty, perussisältötyypin tulee myös olla Empty tai Mixed, jossa sen osa on tyhjennettävissä. Sääntö 5.3, 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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