boomerang::after-install        
boomerang::before-uninstall        
boomerang::get_relevant_subsite       Find the best "top" subsite on the instance. 
boomerang::initialize_widget       Initialize an boomerang widget. 
boomerang::version_info       Get information about available version(s) of the boomerang packages, either from the local filesystem, or from CDN. 
callback::subsite::page_plugin::impl::boomerang       Implementation of subsite::page_plugin for boomerang