具体介绍XML与Web服务和SOA有何关联？

<?xml version='1.0' encoding='UTF-8'?>

<SOAP-ENV:Envelope xmlns:SOAP-ENV=

     "http://schemas.xmlsoap.org/soap/envelope/" 

   xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" 

   xmlns:xsd="http://www.w3.org/1999/XMLSchema">

  <SOAP-ENV:Body>

    <ns1:doGoogleSearch xmlns:ns1="urn:GoogleSearch" 

         SOAP-ENV:encodingStyle=

                  "http://schemas.xmlsoap.org/soap/encoding/">

      <key xsi:type="xsd:string">00000000000000000000000000000000</key>

      <q xsi:type="xsd:string">death star trash compactor</q>

      <start xsi:type="xsd:int">0</start>

      <maxResults xsi:type="xsd:int">10</maxResults>

      <filter xsi:type="xsd:boolean">true</filter>

      <restrict xsi:type="xsd:string"></restrict>

      <safeSearch xsi:type="xsd:boolean">false</safeSearch>

      <lr xsi:type="xsd:string"></lr>

      <ie xsi:type="xsd:string">latin1</ie>

      <oe xsi:type="xsd:string">latin1</oe>

    </ns1:doGoogleSearch>

  </SOAP-ENV:Body>

</SOAP-ENV:Envelope>