XSD for Feature Web Services

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:ems="https://www.thalesgroup.com/ems"
   version="1.0" elementFormDefault="qualified" >
   <xs:element name="feature">
   <xs:complexType>
      <xs:sequence>
         <xs:element name="featureName" maxOccurs="1" minOccurs="1">
            <xs:simpleType>
               <xs:restriction base="xs:string">
                  <xs:minLength value="1"></xs:minLength>
                  <xs:maxLength value="50"></xs:maxLength>
                  <!--<xs:pattern value="[\w\d\s-]+"></xs:pattern>
               --></xs:restriction>
            </xs:simpleType>
         </xs:element>

         <xs:element minOccurs="0" name="featureIdentifier">
            <xs:simpleType>
               <xs:restriction base="xs:int">
                  <xs:minInclusive value="1"></xs:minInclusive>
                  <xs:maxInclusive value="65471"></xs:maxInclusive>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>

	  <xs:element minOccurs="0" name="featureDescription" maxOccurs="1" >
            <xs:simpleType>
               <xs:restriction base="xs:string">
                  <xs:minLength value="0"></xs:minLength>
                  <xs:maxLength value="1024"></xs:maxLength>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
         <xs:element minOccurs="0" name="refId1" maxOccurs="1">
            <xs:simpleType>
               <xs:restriction base="xs:string">
                  <xs:minLength value="0"></xs:minLength>
                  <xs:maxLength value="250"></xs:maxLength>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
         <xs:element minOccurs="0" name="refId2" maxOccurs="1">
            <xs:simpleType>
               <xs:restriction base="xs:string">
                  <xs:minLength value="0"></xs:minLength>
                  <xs:maxLength value="250"></xs:maxLength>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
      </xs:sequence>
   </xs:complexType>
   </xs:element>
</xs:schema>