Is this possible?

    My question is if you can put cardinality in structure tags, for
example:


    <xsd:element name="Catalog">
      <xsd:complexType>
       <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <!--whatever-->
   I look the latest recommendation(because i am using xerces1.4)and looks
like it is not possible, but i remember that this was possible in the
previous recommendation.
   Thanks.