create WSDL by input/output files

According to input & output xml files, I need to create wsdl file for describing web service:

Input xml-file (request):

<?xml version="1.0" encoding="utf-8"?>
        <PEP_IBANCheckRequest>
	<OrderNumber>34552</OrderNumber>
	<IIN>81070581488</IIN>
	<RNN>5851515115</RNN>
	<IBAN>KZ86926002P468708027</IBAN>
	<PaymentAccountType>1</PaymentAccountType>
	<OrderDate>2011-08-26T11:36:59.4050385+06:00</OrderDate>
	</PEP_IBANCheckRequest>

Output xml-file (response):

<?xml version="1.0" encoding="utf-8"?>
 <PEP_IBANCheckResponse>
	<OrderNumber>34552</OrderNumber>
	<OrgOrderNumber>65412</OrgOrderNumber>
	<OrderRunDate>2011-08-26T12:00:51.0369231+06:00</OrderRunDate>
	<Status>0</Status>
	<OrgBIC>65156151</OrgBIC>
	<OrgRNN>5445848</OrgRNN>
 </PEP_IBANCheckResponse>

My incomplete wsdl file:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="PEP_IBANCheckQuery" nillable="true" type="PEP_IBANCheckQuery" />
  <xs:complexType name="PEP_IBANCheckQuery">
    <xs:complexContent mixed="false">
      <xs:extension base="BaseXPO">
        <xs:sequence>
          <xs:element minOccurs="0" maxOccurs="1" name="OrderNumber" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="PSHEPNumber" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="OrgOrderNumber" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="PersonInfo" type="PersonInfo" />
          <xs:element minOccurs="0" maxOccurs="1" name="OrgName" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="PaymentAccountType" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="IBAN" type="xs:string" />
          <xs:element minOccurs="1" maxOccurs="1" name="OrderDate" type="xs:dateTime" />
          <xs:element minOccurs="1" maxOccurs="1" name="OrderRunDate" type="xs:dateTime" />
          <xs:element minOccurs="0" maxOccurs="1" name="Status" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="OrgBIC" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="OrgRNN" type="xs:string" />
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="BaseXPO" abstract="true">
    <xs:complexContent mixed="false">
      <xs:extension base="XPCustomObject" />
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="XPCustomObject" abstract="true">
    <xs:complexContent mixed="false">
      <xs:extension base="XPBaseObject" />
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="XPBaseObject" abstract="true">
    <xs:complexContent mixed="false">
      <xs:extension base="PersistentBase" />
    </xs:complexContent>
  </xs:complexType>
  <xs:complexType name="PersistentBase" />
  <xs:complexType name="PersonInfo">
    <xs:complexContent mixed="false">
      <xs:extension base="BaseXPO">
        <xs:sequence>
          <xs:element minOccurs="0" maxOccurs="1" name="IIN" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="FirstName" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="LastName" type="xs:string" />
          <xs:element minOccurs="0" maxOccurs="1" name="MiddleName" type="xs:string" />
          <xs:element minOccurs="1" maxOccurs="1" name="BirthDate" type="xs:dateTime" />
          <xs:element minOccurs="0" maxOccurs="1" name="RNN" type="xs:string" />
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>

I am completely new to web service stuff, please help me