Piccolo XML Parser and Utilities
com.bluecast.xml Piccolo XML Parser (supports SAX1, SAX2 with extensions 1.0, and JAXP 1.1 SAX parsing), and some XML utility classes.

SAX1 and SAX2 (extensions 1.0)
org.xml.sax This package provides the core SAX APIs.
org.xml.sax.ext This package contains interfaces to optional SAX2 handlers.
org.xml.sax.helpers This package contains "helper" classes, including support for bootstrapping SAX-based applications.

Java API for XML Processing 1.1 (Sun)
javax.xml.parsers Bootstrapping APIs for JAXP parsers.