Return a new ``CT_String`` element with tagname *nsptagname* and
        ``val`` attribute set to *val*.

def new(cls, nsptagname, val):
        """
        Return a new ``CT_String`` element with tagname *nsptagname* and
        ``val`` attribute set to *val*.
        """
        elm = OxmlElement(nsptagname)
        elm.val = val
        return elm