rechercher tous les valeurs dans une reponse XML pour un specifique element

Bonjour ,
S'il vous plait comment extraire tous les valeurs d'un fields dans une reponse XML .

Code:

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<name>offerInformation</name>
<value>
<array>
<data>
<value>
<struct>
<member>
<name>expiryDate</name>
<value>
<dateTime.iso8601>99991231T12:00:00+0000</dateTime.iso8601>
</value>
</member>
<member>
<name>offerID</name>
<value>
<i4>1710</i4>
</value>
</member>
<member>
<name>offerType</name>
<value>
<i4>0</i4>
</value>
</member>
<member>
<name>startDate</name>
<value>
<dateTime.iso8601>20180628T12:00:00+0000</dateTime.iso8601>
</value>
</member>
</struct>
</value>
<value>
<struct>
<member>
<name>expiryDate</name><value>
<dateTime.iso8601>99991231T12:00:00+0000</dateTime.iso8601>
</value>
</member>
<member>
<name>offerID</name>
<value><i4>3753</i4></value>
</member>
<member>
<name>offerType</name>
<value>
<i4>0</i4>
</value>
</member>
<member>
<name>startDate</name>
<value>
<dateTime.iso8601>20180918T12:00:00+0000</dateTime.iso8601>
</value>
</member>
</struct>
</value>
<value>
<struct>
<member>
<name>expiryDate</name>
<value>
<dateTime.iso8601>99991231T12:00:00+0000</dateTime.iso8601>
</value>
</member>
....
....
....
 
</value>
</member>
</struct>
</value>
</data>
</array>
</value>
</member>

J'aimerais extraire tous les vauleurs de offerID : e.g :

offerID = 1710
expiryDate=99991231T12:00:00+0000
offerType=0

offerID = 3753
expiryDate=99991231T12:00:00+0000
offerType=0
startDate= 20180918T12:00:00+0000

merci