I have an xml file in the form

<Executive
<ExecNameJohn Smith</ExecName
<ExecTitleVP</ExecTitle
<Subordinates
<Employee
<EmpNameAlice Waters</EmpName
<EmpTitleSales Rep</EmpTitle
</Employee
<Employee
<EmpNameJohn Thomas</EmpName
<EmpTitleSales Rep</EmpTitle
</Employee
<Employee
<EmpNameMichael Rhodes</EmpName
<EmpTitleSales Rep</EmpTitle
</Employee
</Subordinates
</Executive

It contains lists of repeating lists. I can import the xml into Excel 2003
and 2007, but when I try to export the file as xml I get a message "Cannot
save or export XML data. The XML maps in this workbook are not exportable."

Does Excel not support lists of lists? This is pretty basic XML hierarchy
stuff.