The use of this would be for aesthetic reasons, for works which have a title and a subtitle.
One such example would be a paper like "Sentiment Analysis in Public Transport: A Comparative Study of Machine Learning and Deep Learning Models", where one could split into a title and subtitle at the :
The subtitle should be smaller and therefore less weighted than the "real" title
The use of this would be for aesthetic reasons, for works which have a title and a subtitle.
One such example would be a paper like "Sentiment Analysis in Public Transport: A Comparative Study of Machine Learning and Deep Learning Models", where one could split into a title and subtitle at the ``:``
The subtitle should be smaller and therefore less weighted than the "real" title