Objects don't fit XML very well

• Complex types and simple types   
• XML is labeled structure, not typed information   
• Order matters more in XML than in objects   
• Different kinds of hierarchies   
• Context variations - local and global scoping   
• Extension not symmetrical with restriction   
• block/abstract/final attributes add mystery   
• Type identification in documents   
• Substitution groups cut across hierarchy   
• Keys have no place in the hierarchy   
• For more details, see the older version of this presentation

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