@ModuleOption("whether to set the 'retained' flag")
	public void setRetained(boolean retained) {
		this.retained = retained;
	}
Describes options to the {@code mqtt} sink module.

@author Eric Bottard
@author Gary Russell
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/MqttSinkOptionsMetadata.java