'Sibling CT_Style element identified by the value of `w:name/@w:val`
or |None| if no value is present or no style with that style id
is found.'

@property
def next_style(self):

    next = self.next
    if (next is None):
        return None
    styles = self.getparent()
    return styles.get_by_id(next.val)
