reading a float with XDR

Hi,
as I couldn't read a float with XSD, I'm trying with XDR but it stores it as 
a double and I loss precision when I do a cast --> (float) value.dblVal

VARIANT value;
pNodeAttrValue->get_nodeTypedValue(&value);

value.dblVal has the correct value, but stored as a double, instead of 
value.fltVal

//Esquema.xml
<Schema xmlns="urn:schemas-microsoft-com:xml-data"
              xmlns:dt="urn:schemas-microsoft-com:datatypes">
    ...
<AttributeType name='myfloat' dt:type='float'>
   ...
</Schema>

Thanks in advance.
Davinia.

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