code: public boolean deleteValue(String geoPackage, String property, String value) {
  		boolean deleted = false;
  		PropertiesCoreExtension<T, ?, ?, ?> properties = propertiesMap
  				.get(geoPackage);
  		if (properties != null) {
  			deleted = properties.deleteValue(property, value) > 0;
  		}
  		return deleted;
  	}
docs: Delete the property value from a specified GeoPackage
  
  @param geoPackage
  GeoPackage name
  @param property
  property name
  @param value
  property value
  @return true if deleted