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

@return number of GeoPackages deleted from