<GetUsageStats>
   <Timestamp>timestamp</Timestamp>
   <ProcessingTime>float</ProcessingTime>
   <ImageURL>string</ImageURL>
   <LinkURL>string</LinkURL>
   <Errors>
      <Error id=integer>integer</Error>
   </Errors>
   <Statistics>
      <TotalCalls>integer</TotalCalls>
      <UserStatistics>
         <User name=string>integer</User>
         ... more User nodes ...
      </UserStatistics>
      <CallTypeStatistics>
         <Call name=string>integer</Call>
         ... more Call nodes ...
      </CallTypeStatistics>
      <DailyStatistics>
         <Calls date=date>integer</Calls>
         ... more Calls nodes ...
      </DailyStatistics>
   </Statistics>
</GetUsageStats>