It is very interesting to see the development of Vordel products. More precisely how they are marketing their products.
The "XML Firewall" was like a "Layer 7 Firewall", focusing on the application level.
Then it evolved to XML Gateway, SOA Gateway and now: here is how they define their "API Server": http://www.soatothecloud.com/2012/06/vordel-introduces-api-server.html.
As a side note, I can't resist a little quote against SOAP: http://www.soatothecloud.com/2012/07/what-scales-better-internet-or-esb.html