How to use the pygeodesy.basics._xkwds function in PyGeodesy

'''Convert this cartesian point to a C{Karney}-based
           geodetic point.

           @kwarg LatLon_datum_kwds: Optional L{LatLon}, B{C{datum}} and
                  other keyword arguments, ignored if B{C{LatLon=None}}.
                  Use B{C{LatLon=...}} to override this L{LatLon} class
                  or specify B{C{LatLon=None}}.

           @return: The geodetic point (L{LatLon}) or if B{C{LatLon}}
                    is C{None}, an L{Ecef9Tuple}C{(x, y, z, lat, lon,
                    height, C, M, datum)} with C{C} and C{M} if available.

           @raise TypeError: Invalid B{C{LatLon}}, B{C{datum}} or other
                             B{C{LatLon_datum_kwds}}.
        '''
        kwds = _xkwds(LatLon_datum_kwds, LatLon=LatLon, datum=self.datum)
        return CartesianEllipsoidalBase.toLatLon(self, **kwds)

(C{meter}).
       @kwarg LatLon: Optional class to return the mean point
                      (L{LatLon}).
       @kwarg LatLon_kwds: Optional, additional B{C{LatLon}} keyword
                           arguments, ignored if B{C{LatLon=None}}.

       @return: Point at geographic mean and mean height (B{C{LatLon}}).

       @raise PointsError: Insufficient number of B{C{points}}.

       @raise TypeError: Some B{C{points}} are not C{LatLon}.
    '''
    n, points = _Nvll.points2(points, closed=False)
    # geographic mean
    m = sumOf(points[i]._N_vector for i in range(n))
    kwds = _xkwds(LatLon_kwds, height=height, LatLon=LatLon)
    return m.toLatLon(**kwds)

def _toLatLon(self, lat, lon, LatLon, LatLon_kwds):
        '''(INTERNAL) Check B{C{LatLon}} and return an instance.
        '''
        kwds = _xkwds(LatLon_kwds, datum=self.datum)
        r = LatLon(lat, lon, **kwds)  # handle .classof
        B = _LLEB if self.datum.isEllipsoidal else _LLB
        _xinstanceof(B, LatLon=r)
        return r

'''Convert this point to C{Karney}-based cartesian (ECEF) coordinates.

           @kwarg Cartesian_datum_kwds: Optional L{Cartesian}, B{C{datum}}
                  and other keyword arguments, ignored if B{C{Cartesian=None}}.
                  Use B{C{Cartesian=...}} to override this L{Cartesian} class
                  or set B{C{Cartesian=None}}.

           @return: The cartesian (ECEF) coordinates (L{Cartesian}) or if
                    B{C{Cartesian}} is C{None}, an L{Ecef9Tuple}C{(x, y, z,
                    lat, lon, height, C, M, datum)} with C{C} and C{M} if
                    available.

           @raise TypeError: Invalid B{C{Cartesian}}, B{C{datum}} or other
                             B{C{Cartesian_datum_kwds}}.
        '''
        kwds = _xkwds(Cartesian_datum_kwds, Cartesian=Cartesian,
                                                datum=self.datum)
        return LatLonEllipsoidalBase.toCartesian(self, **kwds)

def __init__(self, **kwds):  # PYCHOK no *args
        kwds = _xkwds(kwds, **_Neighbors8Defaults)
        _NamedDict.__init__(self, **kwds)  # name=...

def _latlon3(lat, lon, height, func, LatLon, **LatLon_kwds):
    '''(INTERNAL) Helper for L{intersection}, L{intersections2} and L{meanof}.
    '''
    if LatLon is None:
        r = LatLon3Tuple(lat, lon, height)
    else:
        kwds = _xkwds(LatLon_kwds, height=height)
        r = LatLon(lat, lon, **kwds)
    return _xnamed(r, func.__name__)

d1 = gc1.cross(s1).dot(i1)  # +ve means p1 bearing points to i1
        d2 = gc2.cross(s2).dot(i1)  # +ve means p2 bearing points to i1
        if d1 > 0 and d2 > 0:
            d = 1  # both point to i1
        elif d1 < 0 and d2 < 0:
            d = -1  # both point to i2
        else:  # d1, d2 opposite signs
            # intersection is at further-away intersection
            # point, take opposite intersection from mid-
            # point of v1 and v2 [is this always true?]
            d = -s1.plus(s2).dot(i1)

    i = i1 if d > 0 else gc2.cross(gc1, raiser=_paths_)

    h = fmean(hs) if height is None else height
    kwds = _xkwds(LatLon_kwds, height=h, LatLon=LatLon)
    return i.toLatLon(**kwds)  # Nvector(i.x, i.y, i.z).toLatLon(...)

def __init__(self, *args, **kwds):
        if args:  # args override kwds
            if len(args) != 1:
                t = unstr(self.classname, *args, **kwds)
                raise _ValueError(args=len(args), txt=t)
            kwds = _xkwds(dict(args[0]), **kwds)
        if _name_ in kwds:
            _Named.name.fset(self, kwds.pop(_name_))  # see _Named.name
        dict.__init__(self, kwds)

def _latlon4(t, h, n):
        if LatLon is None:
            r = LatLon4Tuple(t.lat, t.lon, h, t.datum)
        else:
            kwds = _xkwds(LatLon_kwds, datum=t.datum, height=h)
            r = LatLon(t.lat, t.lon, **kwds)
        return _xnamed(r, n)