Extensible Markup Language (XML) overview
  - Unicode
 
  - Mostly-tree structure; some other pointers allowed
 
  - Designed for documents, not data - featureful
 
  - Describes documents, not things in the real world
 
  - A different DTD or schema needed for each XML syntax
 
  - Best practice? is Infoset, new model for XQuery and XPath