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At PHP, we write such as:

$varInteger = 1;

At WDDX, we write:

<wddxPacket version='1.0'>
  <header />
  <data>
    <number>1</number>
  </data>
</wddxPacket>

When we want to write:

$studentNumber = 1;
$studentName = "Wiwit Siswoutomo";

We will write:

<wddxPacket version='1.0'>
  <header />
  <data>
    <struct>
	  <var name="studentNumber">
	    <number>1</number>
	  </var>
	  <var name="studentName">
	    <string>Wiwit Siswoutomo</string>
	  </var>
	</struct>
    <number>1</number>
  </data>
</wddxPacket>