I'm using Frontier::Client with success, sending arguments as an array:

$Result = $server->call('myCall', @arguments);
[download]

, which generates

<?xml version="1.0" encoding="ISO-8859-1"?>
<methodCall>
<methodName>myCall</methodName>
<params>
<param><value><string>myString</string></value>
</param>
<param><value><int>123</int></value>
</param>
</methodCall>
[download]

How can I do this?:

<param><value><struct>
   <member>
      <name>lowerBound</name>
      <value><i4>18</i4></value>
      </member>
   <member>
      <name>upperBound</name>
      <value><i4>139</i4></value>
      </member>
   </struct>
</param>
[download]

I.e., how can I create a nested parameter like that?