validation on nillable element

[Wong, Robert]

I've been trying to validate an xml against a schema that contains nillable 
attribute (set to false) for an element.  However xerces does not throw an 
exception despite the element being empty.  Any help please?

<Advertiser_Info>
                <AdvertiserStatus></AdvertiserStatus>
                <AdvertiserNumber>String</AdvertiserNumber>
                <ContractNumber>String</ContractNumber>
                <AdvertiserName>....


<xs:element name="Advertiser_Info">

                <xs:complexType>
                        <xs:sequence>

                                <xs:element name="AdvertiserStatus" 
type="xs:string" nillable="false"/>
                                <xs:element ref="AdvertiserNumber" />
                                <xs:element ref="ContractNumber" />
                                <xs:element ref="AdvertiserName" />
                                <xs:element ref="AgencyName" />
                                <xs:element name="BillingAddress">


Thanks,
-Robert

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