# Receive notification of an unparsed entity declaration event.
	#
	# Note that the notation name corresponds to a notation
	# reported by the `notation_decl` event.
	# It is up to the application to record the entity for later
	# reference, if necessary;
	# unparsed entities may appear as attribute values.
	#
	# If the system identifier is a URL, the parser must resolve it
	# fully before passing it to the application.
	#
	# Parameters:
	#
	# * `name`: unparsed entity's name.
	# * `public_id`: entity's public identifier, or null if none was given.
	# * `system_id`: entity's system identifier, or null if none was given.
	#
	# SEE: `sax::Attributes`
	fun unparsed_entity_decl(name: String, public_id: String,
			system_id: String) do end