XML: The Big Picture

Basic structure: XML 1.0 + Namespaces
Abstract data model: Infoset
Data types and rich validation: XML Schema
Linking: XLink/XPointer
Transformation and rendering: XSL
APIs: SAX, DOM, ...
Query: XML Query
Messaging: XML Protocols
"Semantics": RDF
Special vocabularies: MathML, SVG, SMIL, ebXML,..