XML Structure

The basic structure of an ECHO API message is:

<ServiceName>
 <TransactionName>
  <TransactionSpecificParameter>Transaction_Parameter_Here</TransactionSpecificParameter>
 </TransactionName>
</ServiceName>

The first level indicates what individual service of ECHO is being addressed. The second level identifies the particular transaction that is being requested. If there are no parameters, then that is all that is needed, otherwise the parameters are embedded inside at this level according to the appropriate DTD.