Removing duplicate elements in XML

Removing duplicate elements in XML

My project requires a functionality to convert the input XML file into
DataTable. I am using the following code to do that.
DataSet ds = new DataSet();
ds.Locale = CultureInfo.InvariantCulture;
dataSourceFileStream.Seek(0, SeekOrigin.Begin);
ds.ReadXml(dataSourceFileStream);
dt = ds.Tables[0];
This works quiet right unless the input XML has duplicate elements, for
eg, if the XML file is like below:
<?xml version="1.0" encoding="iso-8859-1"?>
<DocumentElement>
<data>
<DATE>27 September 2013</DATE>
<SCHEME>Test Scheme Name</SCHEME>
<NAME>Mr John</NAME>
<SCHEME>Test Scheme Name</SCHEME>
<TYPE>1</TYPE>
</data>
</DocumentElement>
As you can see above, the element SCHEME appears twice. when this kind of
XML file comes ds.ReadXml(dataSourceFileStream); fails to return right
data table.
Any better way to handle this?