I've got a bunch of data loaded into a TClientDataset, representing an array of complex objects. But when I try to run 

```
Dataset.SaveToFile('c:\test.xml', dfXMLUTF8);

```

it doesn't like it:

Project testing.exe raised exception class EDBClient with message 'Fieldtype not supported for XML.'.

This is a lot less useful than it should be, for two reasons. First off, it doesn't say which field or which field type isn't supported, and second, the actual saving is taking place inside a black-box DLL.

The only field types I'm using in this dataset are integers, strings, booleans, and a few TArrayFields that hold arrays of integer fields. Nothing I'd expect to be all that difficult to serialize. Anyone have any idea why this isn't working?