Four ACEs: A Review of ASCII Compatible Encodings
Addison Phillips - webMethods, Inc.
Internationalized Domain Names (IDN) are one of the interesting new applications for Unicode. Since the start of the IDN effort, there have been a wide array of proposed solutions to the problem of extending the existing DNS system without requiring every server to upgrade software.
The result of this effort has been a proliferation of new Unicode "Transfer Encoding Schemes", called "ACEs" for ASCII Compatible Encodings.
In this session there will be a review of the need for ACE, a brief history of the competing encodings, and the structure of four interesting ACEs: RACE, LACE, DUDE, and AMC-ACE-Z ("Punycode"). The structure of each of these encodings will be examined briefly. A sample program will demonstrate the performance of each with different data sets and languages and point out the weaknesses and strengths of the different approaches.
There will also be a review of some of the other potential uses for ACE encodings and suggested alternatives using existing Unicode features.
Java source code and a sample application will be provided.
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22 May 2002, Webmaster