Packages 
Package Description
projectviewer
The ProjectViewer Plugin API.
projectviewer.action
Creating custom actions.
projectviewer.config
How to use project-specific options.
projectviewer.event
Event Handling.
projectviewer.gui
GUI classes.
projectviewer.importer
Project import.
projectviewer.persist
Project and configuration data persistence.
projectviewer.vpt
Creating custom nodes.