How to extract specific xml tag using xdocument from Soap message?

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C#

XML

C#4.0

This is my soap message.

<pre lang="xml">&lt;SOAP-ENV:Envelope xmlns:SOAP-ENV=&quot;http://schemas.xmlsoap.org/soap/envelope&quot;&gt;
- &lt;SOAP-ENV:Header&gt;
- &lt;Delivery&gt;
  &lt;Src&gt;/AA/BB/CC&lt;/Src&gt;
  &lt;Dest&gt;/AA/BB/CC/DD&lt;/Dest&gt;
  &lt;Reply /&gt;
  &lt;/Delivery&gt;
  &lt;MTXMLMsg MsgType=&quot;REPLY&quot; /&gt;
  &lt;/SOAP-ENV:Header&gt;
- &lt;SOAP-ENV:Body&gt;
- &lt;Response&gt;
- &lt;Results xmlns=&quot;http://xacml.aa.web.com&quot;&gt;
- &lt;Result&gt;
  &lt;Decision&gt;Permit&lt;/Decision&gt;
- &lt;Status&gt;
  &lt;StatusCode Value=&quot;urn:oasis:names:tc:xacml:1.0:status:ok&quot; /&gt;
  &lt;/Status&gt;
- &lt;Obligations&gt;
- &lt;Obligation FulfillOn=&quot;Deny&quot; ObligationId=&quot;PutInCache&quot;&gt;
  &lt;AttributeAssignment AttributeId=&quot;resource&quot; DataType=&quot;http://www.w3.org/2001/XMLSchema#string&quot;&gt;Appgrp:App: grp2&lt;/AttributeAssignment&gt;
  &lt;/Obligation&gt;
- &lt;Obligation FulfillOn=&quot;Deny&quot; ObligationId=&quot;PutInCache&quot;&gt;
  &lt;AttributeAssignment AttributeId=&quot;resource&quot; DataType=&quot;http://www.w3.org/2001/XMLSchema#string&quot;&gt;Appgrp:App: grp1&lt;/AttributeAssignment&gt;
  &lt;/Obligation&gt;
- &lt;Obligation FulfillOn=&quot;Deny&quot; ObligationId=&quot;PutInCache&quot;&gt;
  &lt;AttributeAssignment AttributeId=&quot;resource&quot; DataType=&quot;http://www.w3.org/2001/XMLSchema#string&quot;&gt;Appgrp:App:grp1: subgrp1&lt;/AttributeAssignment&gt;
  &lt;/Obligation&gt;
  &lt;/Obligations&gt;
  &lt;/Results&gt;
  &lt;/Result&gt;
  &lt;/Response&gt;
  &lt;/SOAP-ENV:Body&gt;
  &lt;/SOAP-ENV:Envelope&gt;</pre>

I need AttributeAssignment values (Appgrp:App: grp2,Appgrp:App: grp1,Appgrp:App:grp1: subgrp1) as array using xdocument in c#.