[xsl] XSD Question

Hi Everyone!

Can you tell me how to make this field required using this XSD?

<?xml version=3D"1.0" encoding=3D"UTF-8" standalone=3D"yes"?> 
<xs:schema xmlns:xs=3D"http://www.w3.org/2001/XMLSchema";
elementFormDefault=3D"qualified">
        <xs:element name=3D"assignedto">
                <xs:simpleType>
                        <xs:restriction base=3D"xs:string"/>
                </xs:simpleType>
        </xs:element>
        <xs:element name=3D"request">
                <xs:complexType>
                        <xs:choice maxOccurs=3D"unbounded">
                                <xs:element ref=3D"assignedto"/>

                        </xs:choice>
                </xs:complexType>
        </xs:element>
        <xs:element name=3D"requests">
                <xs:complexType>
                        <xs:sequence>
                                <xs:element ref=3D"request"
maxOccurs=3D"unbounded"/>
                        </xs:sequence>=09
                </xs:complexType>
        </xs:element>
</xs:schema>

Thanks!
James


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