Corporate identity may include many things. A brand book is probably a key element of it. It’s like a bible for corporate usage.
The brand book contains the naming of the enterprise, its logo, and colour palette, to name a few.
Even more, there are a lot of rules and regulations inside.
The corporate identity book presents how your logo and your slogan should be printed in colour, or black and white. It tells you about any other color scheme as well.
Also, brand book explains how those things should be positioned.
The graphic designer must take into consideration everything, starting from colour palette to the position of all elements on paper or light box.
In addition to the brand book, corporate ID contains some paper folder layouts, business card design, fax blanks, and similar stuff.
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Other examples of my design are in my portfolio.