2.1. A Brief History of XML2.2. Markup, Elements, and Structure2.3. Namespaces2.4. Spacing2.5. Entities2.6. Unicode, Character Sets, and Encodings2.7. The XML Declaration2.8. Processing Instructions and Other Markup2.9. Free-Form XML and Well-Formed Documents2.10. Declaring Elements and Attributes2.11. Schemas2.11.1. Other Schema Strategies2.12. Transformations