validation on nillable element

["Wong, Robert" <Ro...@latimes.com>]

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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