problem in applying restriction on xml attribute jaxb i.e. unable to do validation for attributes

[ganesh b pol]

my xsd file is

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

    <xs:element name="mq_systems">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" ref="mq_system"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="mq_system">
        <xs:complexType>
            <xs:attribute name="id" use="required" type="xs:NCName"/>
            <xs:attribute name="type" use="required" type="xs:string"/>
            <xs:attribute name="ip"  type="xs:string"/>
           [color=red] <xs:attribute name="port">
				<xs:simpleType>
						<xs:restriction base="xs:integer">
							<xs:minInclusive value="0"/>  
							<xs:maxInclusive value="9999"/>  
						</xs:restriction>
				</xs:simpleType>
	    	</xs:attribute>[/color]            <xs:attribute name="user_name"  type="xs:string"/>	
            <xs:attribute name="password" type="xs:string"/>
            <xs:attribute name="mq_manager_name"  type="xs:string"/>	
            <xs:attribute name="channel_name" type="xs:string"/>
            <xs:attribute name="queue_name" type="xs:string"/>		
        </xs:complexType>
     </xs:element>
</xs:schema>

here i have applied restriction on port attribute

my xml file is

<?xml version="1.0" encoding="UTF-8"?>
<mq_systems xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
  xsi:noNamespaceSchemaLocation='file:/D:/projects/messaging/messaging/src/config/mq/mq_send_message_systems.xsd'>
<mq_system id="switch_pru" type="ibm" ip="10.16.21.167" port="90009" user_name="abc" password="pass"/>
<mq_system id="switch_pru2" type="ibm" ip="10.16.21.167" port="9000" user_name="abc" password="pass"/>
</mq_systems>

first element is with invalid port number i.e. 90009

when i am parsing this xml file with JAXB
i am unable to get any error
code for parsing XML file is

 JAXBContext context = JAXBContext.newInstance(""com.gp.common.messaging.mq.jaxb"");
       Unmarshaller unmarshaller = context.createUnmarshaller();
       MqSystems mqSystems=(MqSystems) unmarshaller.unmarshal(ioSt);