Schemas

Like DTDs, but better:

• Functionality of DTDs
• XML syntax
• Inlude:
• Datatypes:
  • More than 30 types instead of 10!)
  • Can define the lexical representation (must be of form dd.ddd, say)
• Inheritance (can create your own datatypes)
• Schema combination rules
• Proper namespace support
• Richer content model
• Better hooks for documentation and semantics