What makes you think that the Lotus XML Toolkit can export from a ViewEntryCollection? Its documentation seems to confirm what Wouter has already written.
If I use the Lotus XML Toolkit to export a view, I only get design data from the view note. I do not get the view’s entries. What makes you think that the Lotus XML Toolkit can export the data that Wouter wants – the data that ReadViewEntries exports?
Although the dtd (domino.dtd) included within the XML Toolkit does include entries for view elements, it does not provide the functionality to export views.
The best way forward would be to either utilise the ReadViewEntries url on the backend or to ‘roll your own’ viewExporter using the dtd entries as a starter point.