Append xml elements to a file

Question

Ok. After solve the problem of append to files using a file adapter in osb (Re: Write/Append text file with OSB now i want to know if there is some way to append elements to an existant xml. For each request i will have the following message:
<root_node>
<msg>
<element />
<element />
<inner>
<inner_data />
</inner>
<inner>
<inner_data />
</inner>
<msg>
</root_node>
And, for two requests ai want to log:
<root_node>
<msg>
<element />
<element />
<inner>
<inner_data />
</inner>
<inner>
<inner_data />
</inner>
<msg>
<msg>
<element />
<element />
<inner>
<inner_data />
</inner>
<inner>
<inner_data />
</inner>
<msg>
</root_node>
And no:
<root_node>
<msg>
<element />
<element />
<inner>
<inner_data />
</inner>
<inner>
<inner_data />
</inner>
<msg>
</root_node>
<root_node>
<msg>
<element />
<element />
<inner>
<inner_data />
</inner>
<inner>
<inner_data />
</inner>
<msg>
</root_node>
As i'm doing (in my tests).
Thank you.

Answer 1

do you want to append/insert nodes in the file
or do you want to construct that xml first in the osb and after that insert the xml in the file ?
http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/userguide/modelingmessageflow.html
Message Processing Actions
Insert activity
you can use the insert activity to insert/append xml parts in your payload, and when the format is done, write it to the file