XML Schema in mendix does not allow choice element in xsd. What do I replace it with such that it does not add any extra restriction?

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XML Schema in mendix does not allow choice element in xsd. What do I replace it with such that it does not add any extra restriction? Here is the choice element:   <xs:complexType name="pre.content" mixed="false">     <xs:choice minOccurs="0" maxOccurs="unbounded">       <xs:element ref="a"/>       <xs:group ref="fontstyle"/>       <xs:group ref="phrase"/>       <xs:group ref="special.pre"/>     </xs:choice>   </xs:complexType>
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