How to map a column of xml data type?

I need to map a column of xml data type. I think something like this might w开发者_如何学JAVAork but what type should i specify in type atribute? What is the coresponding C# data type to the postgres xml data type? (i need to write the mapping but the entities are not ready yet and might not be written by me)

    <property name="XmlFoo" type="">
        <column name="XmlFoo" sql-type="xml" />
    </property>

What is the proper way to do the mapping?

Thanks for replies!

UPDATE:

It seems that the right type is StringClob which is a specific NHibernate Type. Using StringClob instead of just String allows it to have a size over 4k.

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Have you tried:

<property name="XmlFoo" type="StringClob">
    <column name="XmlFoo" sql-type="xml" />
</property>

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Did you mean StringClob?

The accepted answer (type="StringBlob") didn't work for me, and I see no reference to StringBlob on nhibernate.info.

However, type="StringClob" worked like a charm (albeit on SQL Server.)