The Schema and the Infoset
 
  - So crucially, schemas are about infosets, not character
sequences.
- You could assess a DOM tree you built by hand!
   
    - Using a schema corresponding to a schema document which exists only as a DOM tree ditto
 
- This is what the XML Activity is for:
   
    - Leveraging our work across specifications.
- Not starting over from scratch every time.
 
- It simplifies the design tremendously
   
    - but is hard to get your head around at first