docs: public boolean expireAttribute(final String identifier,
  			final String attribute, final long expirationTime) {
  		if (identifier == null) {
  			log.error("Unable to expire an attribute with a null Identifier value.");
  			return false;
  		}
  
  		if (attribute == null) {
  			log.error("Unable to expire a null attribute.");
  			return false;
  		}
  
  		if (this.originString == null) {
  			log.error("Origin has not been set.  Cannot expire attributes without a valid origin.");
  			return false;
  		}
  
  		ExpireAttributeMessage message = new ExpireAttributeMessage();
  
  		message.setId(identifier);
  		message.setAttributeName(attribute);
  		message.setExpirationTime(expirationTime);
  		message.setOrigin(this.originString);
  
  		this.session.write(message);
  		log.debug("Sent {}", message);
  
  		return true;
  	}