'Set val attribute of <w:pStyle> child element to *style*, adding a
new element if necessary. If *style* is |None|, remove the <w:pStyle>
element if present.'

@style.setter
def style(self, style):

    if (style is None):
        self._remove_pStyle()
        return
    pStyle = self.get_or_add_pStyle()
    pStyle.val = style
