http://www.oasis-open.org/committees/download.php/33412/W096_09-07.pdf

Quote from Jeff Estefan who is one of the primary authors behind the document:

"This joint white paper explains and positions standards for SOA reference models, ontologies, reference architectures, maturity models, modeling languages, and governance. It outlines where the works are similar, highlights the strengths of each body of work, and touches on how the work can be used together in complementary ways. It is also meant as a guide to users of these specifications for selecting the technical products most appropriate for their needs, consistent with where they are today and where they plan to head on their SOA journeys."