Packages 
Package Description
com.ctc.wstx.api  
com.ctc.wstx.cfg  
com.ctc.wstx.compat
Package that contains classes that allow abstracting out of details of JDK platform version being used.
com.ctc.wstx.dom  
com.ctc.wstx.dtd
Package that contains Woodstox classes that implement DTD handling.
com.ctc.wstx.ent
Package contains internal entity object implementations, which are used by stream reader classes, but parsed by dtd functionality.
com.ctc.wstx.evt
Package contains Woodstox implementation of the StAX event layer; functionality that is built on top of stream readers and writers.
com.ctc.wstx.exc
Package that contains all exceptions Woodstox readers and writers throw.
com.ctc.wstx.io
Low-level classes that are used to abstract most details of stream I/O access from actual parsing classes.
com.ctc.wstx.msv  
com.ctc.wstx.sax  
com.ctc.wstx.sr
This package contains supporting code for handling namespace information; element stacks that keep track of elements parsed and such.
com.ctc.wstx.stax
This package contains miscellaneous classes that implement Woodstox.
com.ctc.wstx.sw  
com.ctc.wstx.util
Contains utility classes that are not directly Woodstox specific, but are for now only used by Woodstox.
org.codehaus.stax2  
org.codehaus.stax2.evt  
org.codehaus.stax2.io  
org.codehaus.stax2.ri  
org.codehaus.stax2.validation