Mapping to varchar(max) columns

I've got some data which I would like to store in a varchar(max)
column against line items.  What should I use as a value for the
Precision attribute in the Table\Columns\Column node in the
OrderObjectMappings.xml file?

Does CS2007 sup****t the new varchar(max) data type in SQL Server 2005,
or am I restricted to using ntext? I can't seem to find any mention of
it in relation to CS2007 anywhere.

Many thanks,
Julian