How can a semicolon be used as a context clue?

A semicolon can indicate that something of greater value is coming on the other side.
A semicolon can indicate that something of lesser value is coming on the other side.
A semicolon can indicate that something complex is on the other side of the semicolon.
A semicolon can indicate that something that is strongly connected with the text is on the other side of the semicolon.