Drag and drop tree editor that reads/writes/edits to XML

Hi,
I wondered if anyone knew any good ONLINE tools / GUIs available which gives you a very simple user interface to manage an XML file. This XML file is not complicated at all but simply represents the XML tree but allows the user to move nodes, add nodes and delete nodes.
Many Thanks in advance
Nick

We have an online web content management system but it doesn't have such an interface to control a navigation hierarchy. Everything is done online.
Yes I need a web application to control this. I've looked a bit more but can't find anything helpful, I will have to create this myself.
Thanks
Nick

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