What's a good tool for non-techie-person xml data entry?

[greenstone90]

I have a lot of data to be maintained in an xml file of two levels of hierarchy: e.g.

<Top>
<LookupTable1>
<LookupTable1Parameter1>111</LookupTable1Parameter1>
<LookupTable1Parameter1>222</LookupTable1Parameter2>
</LookupTable1>
<LookupTable2>
<LookupTable2Parameter1>111</LookupTable2Parameter1>
<LookupTable2Parameter1>222</LookupTable2Parameter2>
</LookupTable2>
</Top>

And want to setup for a non-techee person to maintain the data.

I'm looking for a tool for this non-techee person to use for maintaining this data.

I've used Excel as an editing tool (mapping an .xsd to an Excel page) for "one level" hierarchical data...and this works fine (does a "Save As" "Xml Data"). For example:
<Top>
<LookupTableParameter1>111</LookupTableParameter1>
<LookupTableParameter1>222</LookupTableParameter2>
</Top>
But I don't believe I can do "two level" data in Excel.

Suggestion on a tool for a non-techee user to edit two level hierarchical xml data?

Thanks!