from tagger.math.unit._unit import _Unit

class _LengthUnit(_Unit):
    '''
    Defines the abstract length-unit class for tagging.
    
    @since 2018.07.23
    @author tsungjung411@gmail.com
    @see http://tw.bestconverter.org/unitconverter_length.php
    '''
    
    pass
# end-of-class
