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   [OT] Difference between an extensible versus an evolvable information s

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  • To: <xml-dev@lists.xml.org>
  • Subject: [OT] Difference between an extensible versus an evolvable information system?
  • From: "Roger L. Costello" <costello@mitre.org>
  • Date: Wed, 2 Jun 2004 08:32:41 -0400
  • Importance: Normal

Title: Message
Hi Folks,
 
I am interested in hearing your thoughts on the differences between an information system that is extensible versus an information system that is evolvable.
 
For example, suppose that Amazon.com gives users the ability to do a keyword search.  Further, suppose that Amazon empowers its users to create new keywords (and map the new keywords to information at the Web site).  Is this support for new keywords an example of extensibility or evolution?  By adding new keywords has Amazon merely been extended, or has it evolved? 
 
Let's take another example.  Suppose that Amazon gives users the ability to search by book category (e.g., Fiction, Non-Fiction, etc.)  Further, suppose that Amazon empowers its users to create new categories (and map the categories to information at the Web site).  Is this support for new categories an example of extensibility or evolution?  By adding new categories has Amazon merely been extended, or has it evolved?
 
If adding new keywords and adding new categories are merely examples of extension, then can you give an example of evolution?   /Roger




 

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