code: public static boolean isGeoPackageExtension(GeometryType geometryType) {
  		return GeometryCodes.getCode(geometryType) >= GeometryCodes
  				.getCode(GeometryType.CIRCULARSTRING)
  				&& GeometryCodes.getCode(geometryType) <= GeometryCodes
  						.getCode(GeometryType.SURFACE);
  	}
docs: Determine if the geometry type is a GeoPackage extension
  
  @param geometryType
  geometry type
  @return true if a GeoPackage extension, false if user-defined