You are looking at the HTML representation of the WDDX format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the WDDX format, set format=wddx.
See the complete documentation, or API help for more information.
<?xml version="1.0"?>
<wddxPacket version="1.0">
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                    <string />
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                    <string>Concept</string>
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                    <number>147</number>
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                  <var name="case">
                    <string>first-letter</string>
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                    <string>Concept talk</string>
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                    <string />
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                    <string>Concept talk</string>
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                </struct>
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                <struct>
                  <var name="id">
                    <number>170</number>
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                    <string>first-letter</string>
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                  <var name="*">
                    <string>Filter</string>
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                  <var name="subpages">
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                    <string>Filter</string>
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                <struct>
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                    <number>171</number>
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                  <var name="case">
                    <string>first-letter</string>
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                  <var name="*">
                    <string>Filter talk</string>
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                  <var name="subpages">
                    <string />
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                  <var name="canonical">
                    <string>Filter talk</string>
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                </struct>
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                    <number>274</number>
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                  <var name="case">
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                    <string>Widget</string>
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                    <string>Widget</string>
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                <struct>
                  <var name="id">
                    <number>275</number>
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                    <string>first-letter</string>
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                  <var name="*">
                    <string>Widget talk</string>
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                    <string />
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                    <string>Widget talk</string>
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                    <number>420</number>
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                    <number>421</number>
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                    <string>first-letter</string>
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                    <string>Layer talk</string>
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                  <var name="canonical">
                    <string>Layer talk</string>
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              </var>
            </struct>
          </var>
        </struct>
      </var>
    </struct>
 </data>
</wddxPacket>