Title: Null Object Pattern  
Author:Paul King May 18, 2007
Last Changed by:Paul King May 25, 2007
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    Page: Design Patterns with Groovy
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May 25, 2007 04:40 Paul King view changes
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May 25, 2007 04:34 Paul King  
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External Links (2)
    en.wikipedia.org/wiki/Null_Object_pattern
    wiki.rubygarden.org/Ruby/page/show/NullObjectPattern