[Mono-list] How to handle default attributes in XML?

[A.E.]

Hello.
I'm playing around Xml, to create 'default attribute' with a
document type declaration.
Once I thought this mission belongs to XmlValidatingReader.
MS .NET Framework documentation says that XmlTextReader "Does not
expand default attributes," too.

But in fact, the XmlTextReader (not XmlValidatingReader) 
implementation of MS .NET Framework expands default attributes.

Which way is preferable...?

Thanks.

-- A.Enomoto