[rabbitmq-discuss] Binding key and routing key

[Nikita Trophimov]

I'm a bit confused about terms "binding key" and "routing key" in case 
of RabbitMQ. Until this moment, i thought that binding key is the mask 
that connets several RabbitMQ objects like queues and exchanges while 
routing key is the one of the message headers. Am i right? If so, why is 
C# API uses term "routing key" in methods QueueBind, ExchangeBind and 
ExchangeUnbind? I think that it must be "binding key". Java API also 
uses term "routing key" in case of queueBind. Why?