WDDX is a historical programming language created in 1998.

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Example code from Wikipedia:

<wddxPacket version='1.0'>
  <header comment='PHP'/>
  <data>
    <struct>
      <var name='pi'>
        <number>3.1415926</number>
      </var>
      <var name='cities'>
        <array length='3'>
          <string>Austin</string>
          <string>Novato</string>
          <string>Seattle</string>
        </array>
      </var>
    </struct>
  </data>
</wddxPacket>
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Last updated February 11th, 2019