Understanding SOA: java.net

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Java.net has a nice SOA intro/overview article.

Even though I despise when anyone quotes the number of "Google hits" as a guage to the popularity of something I managed to keep reading and the article is, other than that peeve, quite good.

(And it seems to me that message style web services ARE SOA. I understand not all web services are SOA, as not all are loosely coupled - most are request/response - but if they are message style then they can be part of an SOA architecture?)