'Construct an NVARCHAR.
:param length: Maximum data length, in characters.
:param binary: Optional, use the default binary collation for the
national character set.  This does not affect the type of data
stored, use a BINARY type for binary data.
:param collation: Optional, request a particular collation.  Must be
compatible with the national character set.'

def __init__(self, length=None, **kwargs):

    kwargs['national'] = True
    super(NVARCHAR, self).__init__(length=length, **kwargs)
