code: public int deleteAll() {
  		int count = 0;
  		for (String geoPackage : propertiesMap.keySet()) {
  			if (deleteAll(geoPackage)) {
  				count++;
  			}
  		}
  		return count;
  	}
docs: Delete all properties and values from all GeoPackages
  
  @return number of GeoPackages deleted from