New to C$xml

I am trying to learn to use the c$xml routines. Below is a sample xml file I am trying to process. I need to read the information in the CustomValuesXml.

<?xml version="1.0" encoding="utf-8"?>
<Orders Version="3.80">
<Order>
<OrderId>55154</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;charge-back member-number="00167647" role="401" unit-type="A" unit-type-name="Assembly" unit-number="00001185" jurisdiction="Wheeling" jurisdiction-cd="WV" /&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
<Order>
<OrderId>55155</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;offline-payment type="CHECK" number="123" amount="456" control-number="789" state="FL" /&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
<Order>
<OrderId>55156</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;offline-payment type="VIP" member-number="123" council-number="456" control-number="789" amount="123" state="FL" /&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
<Order>
<OrderId>55157</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;offline-payment type="CC" auth-code="123" credit-card-number="4567" control-number="789" amount="101112" state="FL"/&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
<Order>
<OrderId>55158</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;offline-payment type="CB" member-name="MeMember" member-office="MeOffice" member-number="MeNumber" member-role="MeRol" member-email-address="tester@bayshoresolutions.com" unit-type="MeUnit" unit-type-name="MeUnitName" unit-number="MeUnitNumber" jurisdiction="MeJurisdiction" jurisdiction-cd="MECD" council-number="123" control-number="456" amount="789" /&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
<Order>
<OrderId>55159</OrderId>
<CustomValuesXml>&lt;?xml version="1.0" encoding="utf-16"?&gt;&lt;DictionarySerializer&gt;&lt;item&gt;&lt;key&gt;po_number&lt;/key&gt;&lt;value&gt;&amp;lt;offline-payment type="PO" name="MePoPerson" department="MeDept" usage="MeUsage" ordered-by="MeOrderedBy" number="123" date-required="5/22/2016" /&amp;gt;&lt;/value&gt;&lt;/item&gt;&lt;/DictionarySerializer&gt;</CustomValuesXml>
</Order>
</Orders>

Any help would be greatly appreciated.