Primary Key Issue

[khush79]

Hi. I would really appreciate it if someone can tell me why the SSN sub-element in the xml schema, which has been declared as a primary key still allows duplicates when I display it using the main xml file. I still see two SSNs with the same value of 123

XML Schema
==========

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns:xs = "

http://www.w3.org/2001/XMLSchema">

<xs:element name = "Banking" msdata:IsDataSet="true">
<xs:complexType>

<xs:element name = "Customer">
<xs:complexType>
<xs:sequence>
<xs:element = "SSN" type = "xs:integer" minOccurs = "1"
maxOccurs = "1" />
<xs:element = "FirstName" type = "xs:string" minOccurs = "1"
maxOccurs = "1" />
<xs:element = "LastName" type = "xs:integer" minOccurs = "1"
maxOccurs = "1"/>
<xs:element = "CreditReport" type = "xs:string" minOccurs = "0"
maxOccurs = "1"/>
<xs:element = "Zip" type = "xs:integer" minOccurs = "1"
maxOccurs = "1"/>
<xs:element = "AptSuite" type = "xs:string" minOccurs = "0"
maxOccurs = "1" />
<xs:element = "Street" type = "xs:string" minOccurs = "1"
maxOccurs = "1" />
<xs:element = "City" type = "xs:string" minOccurs = "1"
maxOccurs = "1" />
<xs:element = "State" type = "xs:string" minOccurs = "1"
maxOccurs = "1"/>
</xs:sequence>
</xs:complexType>
</xs:element>

</xs:complexType>
<xs:key name="CustomerKey1" msdatarimaryKey="true">
<xs:selector xpath=".//Customer"/>
<xs:field xpath="SSN"/>
</xs:key>

</xs:element>
</schema>

XML File
=========

?xml version = "1.0" ?>
<?xml-stylesheet type="text/xsl" href="template.xsl"?>
<Banking
xsi:noNamespaceSchemaLocation = "C:\Documents and Settings\Burly Ogre\My Documents\USC\585\Mcleod\xml\schema.xsd"
xmlns:xsi = "

http://www.w3.org/2001/XMLSchema-instance">

<Customer>
<SSN>123</SSN>
<FirstName>firstnm</FirstName>
<LastName>lastnm</LastName>
<CreditReport>creditclear</CreditReport>
<Zip>90001</Zip>
<AptSuite>1</AptSuite>
<Street>Street 1</Street>
<City>City 1</City>
<State>State 1</State>

</Customer>

<Customer>
<SSN>123</SSN>
<FirstName>secondnm</FirstName>
<LastName>lastnm</LastName>
<CreditReport>creditclear</CreditReport>
<Zip>90001</Zip>
<AptSuite>1</AptSuite>
<Street>Street 1</Street>
<City>City 1</City>
<State>State 1</State>

</Customer>
</Banking>