Return a newly created styles part, containing a default set of
        elements.

def default(cls, package):
        """
        Return a newly created styles part, containing a default set of
        elements.
        """
        partname = PackURI('/word/styles.xml')
        content_type = CT.WML_STYLES
        element = parse_xml(cls._default_styles_xml())
        return cls(partname, content_type, element, package)