When I begun writing SOA patterns, the first version of chapter 1 was a general introduction to Service Oriented Architecture from the perspective of Software architecture. When the editors saw the patterns chapters they've felt the chapter wasn't focused enough on patterns so I rewrote it untill it finally molded into the current version.

Nevertheless, I think that the first version has value on its own providing some guidance on the influences on architecture and putting SOA in an architectural context. I will probably edit it a little over the next few days so that it would be standalone (i.e. disconnected from the book). Meanwhile you can download the original version from here