 
   "mapper/1d/categorical_mapper",
   "mapper/1d/linear_mapper",
+  "mapper/1d/log_mapper",
   "mapper/2d/grid_mapper",
   "mapper/color/linear_color_mapper",
 


    Glyph:                    'renderer/glyph/glyph_factory'
    LinearAxis:               'renderer/guide/linear_axis'
    CategoricalAxis:          'renderer/guide/categorical_axis'
    DatetimeAxis:             'renderer/guide/datetime_axis'
    Grid:                     'renderer/guide/grid'

    AdaptiveTicker:           'ticking/adaptive_ticker'
    BasicTicker:              'ticking/basic_ticker'
    BasicTickFormatter:       'ticking/basic_tick_formatter'
    LogTicker:                'ticking/log_ticker'
    LogTickFormatter:         'ticking/log_tick_formatter'
    CategoricalTicker:        'ticking/categorical_ticker'
    CategoricalTickFormatter: 'ticking/categorical_tick_formatter'
    CompositeTicker:          'ticking/composite_ticker'
