code: public boolean deleteId(final String identifier) {
  		if (identifier == null) {
  			log.error("Unable to delete a null Identifier value.");
  			return false;
  		}
  
  		if (this.originString == null) {
  			log.error("Origin has not been set.  Cannot delete Identifiers without a valid origin.");
  			return false;
  		}
  
  		DeleteIdentifierMessage message = new DeleteIdentifierMessage();
  		message.setOrigin(this.originString);
  		message.setId(identifier);
  
  		this.session.write(message);
  		log.debug("Sent {}", message);
  
  		return true;
  	}
docs: Deletes an Identifier and all of its Attributes from the world model. All
  data for the Identifier will be removed permanently. Callers may also
  wish to consider expiring the Identifier instead.
  
  @param identifier
  the Identifier to delete
  @return {@code true} if the message was sent successfully