slide 25

How XSD works

• W3C XML Schema
  • does not operate over XML documents
    XML documents are strings of characters and entity references
  • assumes document has been parsed into a “tree”
    with all entities resolved (infoset)
    • composed of structures (nodes)
    • of named types (strings, numbers, booleans, what-have-you)
• Validating with a schema produces a PSVI
  (“post-schema-validation infoset”)
  • trees and their “data content”
  • can be provided with labels (type annotations)
  • defaults (element and attribute) added
  • validity or invalidity outcomes