The update site contains the features of the of Eclipse Web Tools Platform (WTP) These features provide functionality with the executable code only and are recommended for most users. These features provide functionality with the executable code and the source code and are recommended for those extending or debugging WTP. These features provide Unit tests for WTP. WTP Committers, or others testing WTP, will need these in at least their PDE Targets. These features are components produced by WTP Project, which are provided separately for special purposes.