They go together.
The rule book is just that, a book containing the official rules of the game.
The casebook is a supplemental that is intended to help you navigate through most of the "really weird" situations that you'll potentially encounter in a game (and that have almost certainly been encountered by someone, somewhere, long before you got here).
Oftentimes, the casebook plays will reference several rules which must be combined to bring you to the approved ruling.
Using your example, rule 1-3-2 says this:
Quote:
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Originally Posted by Rule 1-3-2
A division line 2 inches wide, shall divide the court into two equal parts. If the court is less than 74 feet long, it should be divided by two lines, each parallel to and 40 feet from the farther end line.
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Pretty simple, right? All this rule does is specify the division line.
Here's the casebook play:
Quote:
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Originally Posted by 1.3.2 SITUATION
A team mascot logo is painted in the center restraining circle. The host school used multi-colored paint for the continuous lines over the team mascot logo in the center restraining circle.
RULING: The area within these lines need not be of one color, but the continuous line must be clearly visible.
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In other words: "The division line has several different sections to it that are different colors... is that legal?"
Answer: "yes, that's legal, as long as the line is clearly visible"