4.1 Background
 4.2 Java SAX Programs
 4.3 Content Handlers
 4.4 Structural Events
 4.5 Character Events
 4.6 Access to Attributes
 4.7 XML Comments
 4.8 Processing Instructions
 4.9 Entity References and CDATA
 4.10 Document Locator
 4.11 Features and Properties
 4.12 SAX Exceptions
 4.13 Error Handlers
 4.14 Input Sources
 4.15 Assignment #2: Simple Queries