Return a new ``CT_DecimalNumber`` element having tagname *nsptagname*
        and ``val`` attribute set to *val*.

def new(cls, nsptagname, val):
        """
        Return a new ``CT_DecimalNumber`` element having tagname *nsptagname*
        and ``val`` attribute set to *val*.
        """
        return OxmlElement(nsptagname, attrs={qn('w:val'): str(val)})