Hi all, I'm looking for a way to merge two XML files (appending/replacing existing values). I have checked out XML::Merge, but unfortunately it doesn't seem to support merging files with conflicts. I'm thinking I may need to write some code to do this as it is a bit of an odd thing to do, and was hoping someone could advise on which libraries I should use? As an example, this is what I want to do. I have an original file, and a "patch" file, and I want to merge these two files so that any additions in the patch file are put in the new file, and any existing nodes in the patch file are updated. Here is a (crude) example of what I mean:

Original File: 

<NODEA>
    <NODEB UID="111" >
        <NODEC name="1" >
            <NODED> text1 </NODED>
            <NODED> text2 </NODED>
        </NODEC>
    </NODEB>
    <NODEB UID="222" >
        <NODEC name="2" >
            <NODED> text1 </NODED>
            <NODED> text2 </NODED>        
        </NODEC>
    </NODEB>
</NODEA>

[download]
Patch File: 
<NODEA>
    <NODEB UID="111" >
          <NODEC name="1" >
              <NODED> patched text 1 </NODED>
              <NODED> patched text 2 </NODED>
          </NODEC>
    </NODEB>
    <NODEB UID="333" >
        <NODEC name="3" >
            <NODED> text1 </NODED>
            <NODED> text2 </NODED>        
        </NODEC>
    </NODEB>
</NODEA>

[download]
Merged File: 
<NODEA>
    <NODEB UID="111" >
         <NODEC name="1" >
            <NODED> patched text 1 </NODED>
            <NODED> patched text 2 </NODED>
         </NODEC>
    </NODEB>
    <NODEB UID="222" >
        <NODEC name="2" >
            <NODED> text1 </NODED>
            <NODED> text2 </NODED>        
        </NODEC>
    </NODEB>
    <NODEB UID="333" >
        <NODEC name="3" >
            <NODED> text1 </NODED>
            <NODED> text2 </NODED>        
        </NODEC>
    </NODEB>
</NODEA>

[download]
I would really appreciate any pointers on what libraries I could use for this, or if there is anything else like XML::Merge that I may have missed. I am thinking of using XML::Twig and to manually build up an array of nodes and compare them (although that sound really messy), but wanted to hear any ideas before I got started.

Thanks!

In reply to Merging two XML files (with conflicts) by pwnguin

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