Contemporary SOA is still maturing
While the characteristics described so far are fundamental to contemporary SOA, this point is obviously more of a subjective statement of where SOA is at the moment. Even though SOA is being positioned as the next standard application computing platform, this transition is not yet complete. Despite the fact that Web services are being used to implement a great deal of application functionality, the support for a number of features necessary for enterprise-level computing is not yet fully available.
Standards organizations and major software vendors have produced many specifications to address a variety of supplementary extensions. Additionally, the next generation of development tools and application servers promises to support a great deal of these new technologies. When SOA platforms and tools reach an adequate level of maturity, the utilization of Web services can be extended to support the creation of enterprise SOA solutions, making the ideal of a service-oriented enterprise attainable.
If you needed to provide an accurate definition of SOA today, you would not be out of line to mention the state of its underlying technology. Considering the rate at which the IT industry as a whole is adopting and evolving the SOA platform, though, it should not be too long before an accurate definition will no longer require this statement.
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