code: private void doList() throws PageException, SearchException {
  	required("collection", action, "name", name);
  	// if(StringUtil.isEmpty(name))throw new ApplicationException("for action list attribute name is
  	// required");
  	pageContext.setVariable(name, getSearchEngine().getCollectionsAsQuery());
      }
docs: Creates a query in the PageContext containing all available Collections of the current
  searchStorage
  
  @throws ApplicationException
  @throws PageException
  @throws SearchException