I want to extend virtual disk size of a vm in vcenter using soap API

[narendra8484]

I have some soap api

<soapenv:Header/>

   <soapenv:Body>

      <urn:ExtendVirtualDisk_Task>

         <urn:_this type="?">?</urn:_this>

         <urn:name>?</urn:name>

         <!--Optional:-->

         <urn:datacenter type="?">?</urn:datacenter>

         <urn:newCapacityKb>?</urn:newCapacityKb>

         <!--Optional:-->

         <urn:eagerZero>?</urn:eagerZero>

      </urn:ExtendVirtualDisk_Task>

   </soapenv:Body>

I need what is will be the urn:name in above soap api.