Combine Jms messages in one xml structure using WSO2 ESB

I have different xml messages on JMS Queue. Each message has reference document id field in it. Now I want if two messages have same reference document id then it will make one xml response and vice versa.

like xml:

message-1

<Root>
<record>
<refdocumentId>123</refdocumentId>
<name>abc</name>
</record>
</Root>

message-2

<Root>
<record>
<refdocumentId>123</refdocumentId>
<name>xyz</name>
</record>
</Root>

messge-3

<Root>
<record>
<refdocumentId>222</refdocumentId>
<name>abc</name>
</record>
</Root>

Output in WSO2 ESB should be like:

for same reference document id (single message)

<Root>
    <record>
    <refdocumentId>123</refdocumentId>
    <name>abc</name>
    </record>
<record>
    <refdocumentId>123</refdocumentId>
    <name>xyz</name>
    </record>
    </Root>

For different reference document id:

<Root>
    <record>
    <refdocumentId>222</refdocumentId>
    <name>abc</name>
    </record>
    </Root>

How can we achieve this scenario in WSO2 ESB. Any help would be great appreciation.