'Set the value of `w:tblPr/w:tblStyle/@w:val` (a table style id) to
*styleId*. If *styleId* is None, remove the `w:tblStyle` element.'

@tblStyle_val.setter
def tblStyle_val(self, styleId):

    tblPr = self.tblPr
    tblPr._remove_tblStyle()
    if (styleId is None):
        return
    tblPr._add_tblStyle().val = styleId
