Retrieving Multiple Nodes values from an XML

Hi,

      I  Have an XML which will be stored into a string i want to retrieve all the Values of

<EmailAddress>values@values.com</EmailAddress>  nodes from the following XML. Depending upon the requirements this  <EmailAddress> nodes may increase or decrease

So how can  i achieve it...

<?xml version="1.0" encoding="UTF-8" ?>
- <feed xmlns="http://www.w3.org/2005/Atom"><id>http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608/events/opens</id><title type="text">Opens Events for Customer: ashwin@test.com, Campaign id: 1113523964608</title><link href="opens" /><link href="opens" rel="self" />
  - <author><name>ashwin@test.com</name></author><updated>2013-05-27T12:39:18.624Z</updated><link href="/ws/customers/ashwin%40test.com/campaigns/1113523964608/events/opens" rel="first" /><link href="/ws/customers/ashwin%40test.com/campaigns/1113523964608/events/opens" rel="current" />
  - <entry><id>http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,64,1369309885000</id><title type="text">Email Open Event for Customer: ashwin%40test.com, Campaign: http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608</title><updated>2013-05-23T11:51:25.000Z</updated>
    - <author><name>Constant Contact</name></author>
    - <content type="application/vnd.ctct+xml">
      - <OpenEvent xmlns="http://ws.test.com/ns/1.0/" id="http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,64,1369309885000">
        - <Contact id="http://api.test.com/ws/customers/example%40example.com/contacts/64"><EmailAddress>hanumantharaotvs@test.com</EmailAddress><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/contacts/64" rel="self" /></Contact>
        - <Campaign id="http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608"><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/campaigns/1113523964608" rel="self" /><Name>2013-05-23T09:04:51.7031250Z</Name></Campaign><EventTime>2013-05-23T11:51:25.000Z</EventTime></OpenEvent></content></entry>
  - <entry><id>http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,46,1369300552000</id><title type="text">Email Open Event for Customer: ashwin%40test.com, Campaign: http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608</title><updated>2013-05-23T09:15:52.000Z</updated>
    - <author><name>Constant Contact</name></author>
    - <content type="application/vnd.ctct+xml">
      - <OpenEvent xmlns="http://ws.test.com/ns/1.0/" id="http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,46,1369300552000">
        - <Contact id="http://api.test.com/ws/customers/example%40example.com/contacts/46"><EmailAddress>dileep.pingeli@test.com</EmailAddress><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/contacts/46" rel="self" /></Contact>
        - <Campaign id="http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608"><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/campaigns/1113523964608" rel="self" /><Name>2013-05-23T09:04:51.7031250Z</Name></Campaign><EventTime>2013-05-23T09:15:52.000Z</EventTime></OpenEvent></content></entry>
  - <entry><id>http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,2,1369300543000</id><title type="text">Email Open Event for Customer: ashwin%40test.com, Campaign: http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608</title><updated>2013-05-23T09:15:43.000Z</updated>
    - <author><name>Constant Contact</name></author>
    - <content type="application/vnd.ctct+xml">
      - <OpenEvent xmlns="http://ws.test.com/ns/1.0/" id="http://api.test.com/ws/customers/example%40example.com/events/opens/1113523964608,2,1369300543000">
        - <Contact id="http://api.test.com/ws/customers/example%40example.com/contacts/2"><EmailAddress>dileep@test.com</EmailAddress><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/contacts/2" rel="self" /></Contact>
        - <Campaign id="http://api.test.com/ws/customers/example%40example.com/campaigns/1113523964608"><link xmlns="http://www.w3.org/2005/Atom" href="/ws/customers/ashwin%40test.com/campaigns/1113523964608" rel="self" /><Name>2013-05-23T09:04:51.7031250Z</Name></Campaign><EventTime>2013-05-23T09:15:43.000Z</EventTime></OpenEvent></content></entry></feed>

Regards, Dillu