How do I decouple an embedded schema within a WSDL?

I am very new to Web services and I would like to know how one would go about saving types define in a wsdl:type section into it's own schema with the idea that one could reuse the schema within multiple WSDL. I have been trying to use the import statement as per below but this has not been very successful.

     <wsdl:types>
  <xsd:schema targetNamespace="http://ttdev.com/ss">
   <xsd:import namespace="http://ttdev.com/ss"schemaLocation="http://ttdev.com/ss/SimpleService.xsd"/>
  </xsd:schema>
 </wsdl:types>

<wsdl:definitions 
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://ttdev.com/ss" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="SimpleService" targetNamespace="http://ttdev.com/ss" xmlns:xi="http://www.w3.org/2001/XInclude">
 <wsdl:types>
 <xsd:schema targetNamespace="http://ttdev.com/ss">
  <xsd:element name="concatRequest">
   <xsd:complexType>
    <xsd:sequence>
     <xsd:element name="param1" type="xsd:string"/>
     <xsd:element name="param2" type="xsd:string"/>
    </xsd:sequence>
   </xsd:complexType>
  </xsd:element>
  <xsd:element name="concatResponse">
   <xsd:complexType>
    <xsd:sequence minOccurs="0" maxOccurs="100">
     <xsd:element name="name" type="xsd:string"/>
     <xsd:element name="description" type="xsd:string"/>
    </xsd:sequence>
   </xsd:complexType>
  </xsd:element>
  </xsd:schema>
 </wsdl:types>
 <wsdl:message name="concatRequest">
  <wsdl:part name="parameters" element="tns:concatRequest"/>
 </wsdl:message>
 <wsdl:message name="concatResponse">
  <wsdl:part name="parameters" element="tns:concatResponse"/>
 </wsdl:message>
 <wsdl:portType name="SimpleService">
  <wsdl:operation name="concat">
   <wsdl:input message="tns:concatRequest"/>
   <wsdl:output message="tns:concatResponse"/>
  </wsdl:operation>
 </wsdl:portType>
 <wsdl:binding name="SimpleServiceSOAP" type="tns:SimpleService">
  <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
  <wsdl:operation name="concat">
   <soap:operation soapAction="http://ttdev.com/ss/NewOperation"/>
   <wsdl:input>
    <soap:body use="literal"/>
   </wsdl:input>
   <wsdl:output>
    <soap:body use="literal"/>
   </wsdl:output>
  </wsdl:operation>
 </wsdl:binding>
 <wsdl:service name="SimpleService">
  <wsdl:port name="p1" binding="tns:SimpleServiceSOAP">
   <soap:address location="http://localhost:8080/ss/p1"/>
  </wsdl:port>
 </wsdl:service>
</wsdl:definitions>

To summarize:

1. I have isolated the schema into its own file SinpleService.xsd (as per code sample below)
2. I have added an import statement to the WSDL as per above.
3. However it looks like types cannot be resolved when I reference them via the import.

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns2="http://ttdev.com/ss" 开发者_StackOverflow社区targetNamespace="http://ttdev.com/ss">
 <xsd:import namespace="http://schemas.xmlsoap.org/soap/encoding/" schemaLocation="http://schemas.xmlsoap.org/soap/encoding/"/>
 <xsd:import namespace="http://www.w3.org/2001/XMLSchema"/>
 <xsd:element name="concatRequest">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element name="param1" type="xsd:string"/>
    <xsd:element name="param2" type="xsd:string"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 <xsd:element name="concatResponse">
  <xsd:complexType>
   <xsd:sequence minOccurs="0" maxOccurs="100">
    <xsd:element name="name" type="xsd:string"/>
    <xsd:element name="description" type="xsd:string"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
</xsd:schema>

Try this:

SimpleServiceSchema.xsd:

<xsd:schema targetNamespace="http://ttdev.com/ss/include" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:complexType name="concatRequestType">
        <xsd:sequence>
            <xsd:element name="param1" type="xsd:string"/>
            <xsd:element name="param2" type="xsd:string"/>
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="concatResponseType">
        <xsd:sequence minOccurs="0" maxOccurs="100">
            <xsd:element name="name" type="xsd:string"/>
            <xsd:element name="description" type="xsd:string"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>


<wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://ttdev.com/ss" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:inc="http://ttdev.com/ss/include" name="SimpleService" targetNamespace="http://ttdev.com/ss">
    <wsdl:types>
        <xsd:schema targetNamespace="http://ttdev.com/ss">
            <xsd:import namespace="http://ttdev.com/ss/include" schemaLocation="SimpleServiceSchema.xsd"/>
            <xsd:element name="concatRequest" type="inc:concatRequestType"/>
            <xsd:element name="concatResponse" type="inc:concatResponseType"/>
        </xsd:schema>
    </wsdl:types>
    <wsdl:message name="concatRequest">
        <wsdl:part name="parameters" element="tns:concatRequest"/>
    </wsdl:message>
    <wsdl:message name="concatResponse">
        <wsdl:part name="parameters" element="tns:concatResponse"/>
    </wsdl:message>
    <wsdl:portType name="SimpleService">
        <wsdl:operation name="concat">
            <wsdl:input message="tns:concatRequest"/>
            <wsdl:output message="tns:concatResponse"/>
        </wsdl:operation>
    </wsdl:portType>
    <wsdl:binding name="SimpleServiceSOAP" type="tns:SimpleService">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
        <wsdl:operation name="concat">
            <soap:operation soapAction="http://ttdev.com/ss/NewOperation"/>
            <wsdl:input>
                <soap:body use="literal"/>
            </wsdl:input>
            <wsdl:output>
                <soap:body use="literal"/>
            </wsdl:output>
        </wsdl:operation>
    </wsdl:binding>
    <wsdl:service name="SimpleService">
        <wsdl:port name="p1" binding="tns:SimpleServiceSOAP">
            <soap:address location="http://localhost:8080/ss/p1"/>
        </wsdl:port>
    </wsdl:service>
</wsdl:definitions>

(thank you, XMLSpy)

You need a space after the quotation mark:

<xsd:import namespace="http://ttdev.com/ss"schemaLocation="http://ttdev.com/ss/SimpleService.xsd"/>

should be

<xsd:import namespace="http://ttdev.com/ss" schemaLocation="http://ttdev.com/ss/SimpleService.xsd"/>