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La referencia de grupo a 'all' debe tener {min occurs}={max occurs}=1.
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The group ref to 'all' must have {min occurs}= 0 or 1 and {max occurs}=1.
Search by GoogleLa referencia de grupo a 'all' debe tener {min occurs}={max occurs}=1.
The group ref to 'all' must have {min occurs}= 0 or 1 and {max occurs}=1.
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