Fundamentally, computers just deal with numbers. They store letters and other characters by assigning a number for each one. There are hundreds of different encoding systems for mapping characters to numbers, but Unicode promises a single mapping. Unicode enables a single software product or website to be targeted across multiple platforms, languages and countries without re-engineering. It's no wonder that industry giants like Apple, Hewlett-Packard, IBM andMicrosoft have all adopted Unicode.

Containing everything you need to understand Unicode, this comprehensive reference from O'Reilly takes you on a detailed guide through the complex character world. For starters, it explains how to identify and classify characters - whether they're common, uncommon, or exotic. It then shows you how to type them, utilize their properties, and process character data in a robust manner.

The book is broken up into three distinct parts. The first few chapters provide you with a tutorial presentation of Unicode and character data. It gives you a firm grasp of the terminology you need to reference various components, including character sets, fonts and encodings, glyphs and character repertoires.

The middle section offers more detailed information about using Unicode and other character codes. It explains the principles and methods of defining character codes, describes some of the widely used codes, and presents code conversion techniques. It also discusses properties of characters, collation and sorting, line breaking rules and Unicode encodings. The final four chapters cover more advanced material, such as programming to support Unicode.

You simply can't afford to be without the nuggets of valuable information detailed in Unicode Explained.

Amazon.com® Reader Reviews (Ranked by Helpfulness)

Average Amazon.com® Rating:  Based on 7 Ratings

Excellent explanation, but Windows-centric examples - 2007-02-01
Reviewer Rating:
This book is excellent. The author's writing style is easy to read and he pretty much explains everything about Unicode. It's perfect if you're working with multi-lingual Web sites or email, or just if you want to start using Unicode for all of your Web site development (something everyone should do).

The only thing disappointing about this book is that all of his examples and screen shots are for and from Windows. A reader could come away with the feeling that Mac OS X and Linux don't have as much support for Unicode as Windows which, of course, is not the case at all. The least he could have done is to mention and give screenshots of Linux's "Character Map" app and Mac OS X's built-in "Character Palette", both of which are pretty much just like the Windows "Character Map" app.

I'm surprised O'Reilly allowed a book about such a platform-neutral subject to be so Windows-centric. Hopefully they can hire someone to add Linux and Mac OS X examples into the second edition.

Very Comprehensive and Practical - 2007-10-07
Reviewer Rating:
I had to deal with Unicode in greater detail for two reasons. I am working on some old ASCII and ANSI text converter for the web to be able to show them in text format in a browser, rather than converting them to an image as existing tools do. The second reason is XML and the normalization of the content distributed via XML and processed or used by XSLT or DHTML apps.

I realized that the whole subject is a lot more complicated than I initially thought and the number of questions that needed an answer to move forward with what I was doing increased significantly. I was finding stuff on the web, a little bit here and a little bit there and had it one day, because progress was slow.

I stumbled one day across this book via a Google search, which returned passages from it from its Google Book search results. I found a very good answer to one of my questions and answers to some other questions that were lying around unanswered from before. I checked the index of the book to see what subjects it covers and realized that it pretty much covers all of them. So I went ahead to Amazon and bought it right there and then.

I am glad to this day that I found it and can recommend it to anybody who has only little or no knowledge of Unicode and struggles with getting a grip on all those standards for data encoding, which make it hard to keep the data within XML and text files intact across platforms and prevent your XML based application or tool from breaking because of illegal data in your content.

VERY VERY HIGHLY RECOMMENDED!! - 2006-11-26
Reviewer Rating:
Are you an IT professional who needs to understand Unicode and work with it? If you are, then this book is for you. Author Jukka Korpela, has done an outstanding job of writing a book that explores Unicode processing generally, but does not go into great detail on all parts of the Unicode character space.

Korpela, begins by providing a self-contained tutorial presentation of Unicode and character data. Then, the author gives detailed information about using Unicode and other character codes. Finally, he discusses relatively independent topics to be read according to each reader's specific needs.

This most excellent book guides you through the Unicode and character world. More importantly, it explains how to identify and classify characters.

Best overall Unicode reference - 2009-02-22
Reviewer Rating:
Although the "Unicode Standard" is the authoritative Unicode reference book, it's not exactly what I'd call a "good read." This is the first book that I'd happily recommend to anyone wanting an easy-to-understand Unicode book. But make no mistake -- this is a thorough book. Jukka did a great job of making a difficult subject a lot less difficult.

Clear, Contextual and Comprehensive - 2008-05-10
Reviewer Rating:
The author presents Unicode well from all possible angles. He also explains related topics like character encodings, transfer encodings, ways to input the characters in popular software programs, font issues, portability. It is well written.

Its side notes are also interesting - explaining things like Arabic right-to-left with its contextual characters with 4 different forms; or how they mused over using one common Chinese Han character to be shared by Japanese , Koreans and Vietnamese versus including a version of each in their languages' ranges of individually separate characters.

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