Example scenario:

New install of JBDS/JBossTools, install the ESB tooling, create a server runtime for SOA 5.2, and a corresponding ESB runtime of 4.10.

Then, create a new ESB project - and the ESB runtime displayed in the wizard is 4.12, as this automatically defaults to the highest supported facet version on the runtime.

For each version of ESB, we have declared an explicit facet. In org.jboss.tools.esb.project.core, we have facets defined (4.2,4.3,4.4,4.5,4.6,4.7,4.9,4.10,4.11,4.12) and assign them to EAP runtime components (4.3,5.0,6.0) (which are specified in the AS tools plug-ins). So every version of SOA-P based on EAP 4.3, 5.x, or 6.x supports every facet version we've defined thus far - up to 4.12