The following is a brief overview of the JBossJTA source tree.
It can be found in the transaction subdirectory when you check out JBoss.
build.bat - for building on Windows
build.sh - for building on Unix
build.xml - the ant build script
src - the source code
etc - a manifest for the jars
main - the main source code
org.jboss.tm - all the source is one package