Property Transfer problem

I have problem with get greatest id from the following xml response. I want to use Property Transfer to use it as a parameter for another process.
I tried this //e[not(//e/id > id)]/id but it didn't worked. I set the property to "ResponseAsXml".

<Response>
<e>
<businessKey null="true"/>
<ended>false</ended>
<id>994</id>
<processDefinitionId>post-cash-approval:1:850</processDefinitionId>
<processInstanceId>994</processInstanceId>
<suspended>false</suspended>
</e>
<e>
<businessKey null="true"/>
<ended>false</ended>
<id>99</id>
<processDefinitionId>fixSystemFailure:1:35</processDefinitionId>
<processInstanceId>99</processInstanceId>
<suspended>false</suspended>
</e>
<e>
<businessKey null="true"/>
<ended>false</ended>
<id>982</id>
<processDefinitionId>post-cash-approval:1:850</processDefinitionId>
<processInstanceId>982</processInstanceId>
<suspended>false</suspended>
</e>
<e>
<businessKey null="true"/>
<ended>false</ended>
<id>969</id>
<processDefinitionId>post-cash-approval:1:850</processDefinitionId>
<processInstanceId>969</processInstanceId>
<suspended>false</suspended>
</e>
</Response>