我正在寻找有关消息传递协议SMQP（简单消息队列协议）的一些信息。我在互联网上找不到太多，所以我决定在这里问一下，因为有人可能知道：
1) What are the main differences between SMQP and AMQP protocols?
2) What are the main differences between SMQP and JMS protocols?
3) Is SMQP based on JMS? If so, can a standard JMS implementation be used?
4) Is there any open source implementation of the SMQP protocol for Java?
5) Is this protocol being used anywhere?
如果您还有一些信息我会很感激。
感谢您的帮助！