code: public boolean addValue(String geoPackage, String property, String value) {
  		boolean added = false;
  		PropertiesCoreExtension<T, ?, ?, ?> properties = propertiesMap
  				.get(geoPackage);
  		if (properties != null) {
  			added = properties.addValue(property, value);
  		}
  		return added;
  	}
docs: Add a property value to a specified GeoPackage
  
  @param geoPackage
  GeoPackage name
  @param property
  property name
  @param value
  value
  @return true if added