def METHOD_NAME(self, scale_factor=1., fill_color=None):
    """Returns a group of SVG circle elements for the MultiPoint geometry.
    Parameters
    ==========
    scale_factor : float
        Multiplication factor for the SVG circle diameters.  Default is 1.
    fill_color : str, optional
        Hex string for fill color. Default is to use "#66cc99" if
        geometry is valid, and "#ff3333" if invalid.
    """
    if self.is_empty:
        return '<g />'
    if fill_color is None:
        fill_color = "#66cc99" if self.is_valid else "#ff3333"
    return '<g>' + \
        ''.join(p.METHOD_NAME(scale_factor, fill_color) for p in self) + \
        '</g>'