DZone has an interesting article about new OpenMQ's features:
"OpenMQ provide different transport protocol and access channels to access OpenMQ functionalities from different prgramming . One of the access channels which involve HTTP is named Universal Message Service (UMS) which provide a simple REST interaction template to place messages and consume them from any programming language and device which can interact with a network server. UMS has some limitations which is simply understandable based on the RESTful nature of UMS. For current version of OpenMQ, it only supports Message Queues as destinations so there is no publish-subscribe functionality available."
Read the full article.