From: Erling Jepsen <ejepsen@...>
Date: 2006-07-11T23:48:37+09:00
Subject: Merging two REXML element-lists.

Hello,

I have two xml files which are identical almost identical. #1 holds all 
possible values to the application. #2 holds a selected subset of values 
which should overwrite the values of the first where identical.

ie.
--#1---
<?xml version="1.0" encoding="UTF-8"?>
<instance>
  <environments>
    <environment range="all">
      <configfiles>
        <configfile filename="%instance%.rsp">
         <setting stanza="[webseal-config]" key="-name" value="My 
Instance"/>
         <setting stanza="[webseal-config]" key="-username" 
value="my_user"/>
         <setting stanza="[webseal-config]" key="-password" 
value="dummy-pwd"/>
        </configfile>
      </configfiles>
    </environment>
  </environments>
</instance>
-------

--#2---
<?xml version="1.0" encoding="UTF-8"?>
<instance>
  <environments>
    <environment range="all">
      <configfiles>
        <configfile filename="%instance%.rsp">
         <setting stanza="[webseal-config]" key="-password" 
value="secret123"/>
         <setting stanza="[webseal-config]" key="-host" 
value="main_server"/>
        </configfile>
      </configfiles>
    </environment>
  </environments>
</instance>
------

What I need is a result-set that looks like this that I can do some 
xpath on...

<?xml version="1.0" encoding="UTF-8"?>
<instance>
  <environments>
    <environment range="all">
      <configfiles>
        <configfile filename="%instance%.rsp">
         <setting stanza="[webseal-config]" key="-name" value="My 
Instance"/>
         <setting stanza="[webseal-config]" key="-username" 
value="my_user"/>
         <setting stanza="[webseal-config]" key="-password" 
value="secret123"/>
         <setting stanza="[webseal-config]" key="-host" 
value="main_server"/>
        </configfile>
      </configfiles>
    </environment>
  </environments>
</instance>
------

In general what has happend is that the two results have merged. Results 
from #2 have overwritten #1 where identical.

It looks like a rather simple "Merge" to me but I can't figure out how 
to do this in RMXML

I would very much appreciate your help! Thank you

//Erling

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