org.apache.tools.ant.taskdefs.optional
Classes 
ANTLR
Cab
Javah
Native2Ascii
NetRexxC
PropertyFile
PropertyFile.Entry
PropertyFile.Entry.Operation
PropertyFile.Entry.Type
RenameExtensions
Script
StyleBook
Test
Test.TestletEntry
TraXLiaison
XalanLiaison
XslpLiaison