I'm writing an app that, at its heart, uses a hierarchical tree of nodes

in XML, it looks like this:

<node>
   <name>Node1</name>
   <Attribute1>Something</Attribute1>
   <Attribute2>SomethingElse</Attribute2>
   <child>Node2</child>
   <child>Node4</child>
   <child>Node7</child>
</node>

And so on (all child elements must refer to an existing node, though the node inquestion doesnt have to precede the first reference to it)

For a simple structure like this is there a simple tool to generate a html page that will allow a user to enter Nodes and dynamically update a server-side xml file?

Im basically writing a tool that will use such a file, but the people who's job it is to create the file arent especially techno-literate, so creating the XML by hand is a no-no.

I could hand-crank one fairly quickly, but if I can get a tool to do it, even better (especially as the format may change in future)....