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David Linthicum

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Top Stories by David Linthicum

Last month an alliance of leading vendors announced progress on specifications to define a language-neutral programming model for application development in SOA environments. They call this specification Open SOA Collaboration. In essence, they are proposing a new standard to create and manage IT, making the process of integrating different third-party SOA technologies "less onerous," they say. Or, we can call this a standard way of delivering services, making it easier to work and play well together. So, who's in the gang? BEA, IBM, Oracle, and SAP first got together last November to begin work on the common programming model, along with Iona, Sybase, Xcalia SA, and Zend Technologies Ltd. Others are joining the mix, including Software AG and Red Hat. This group has concentrated its efforts on two projects - service component architecture (SCA) and service data obje... (more)

SOA - Loosely Coupled...What?

With the advent of Web services and SOA, we've been seeking to create architectures and systems that are more loosely coupled. Loosely coupled systems provide many advantages including support for late or dynamically binding to other components while running, and can mediate the difference in the component's structure, security model, protocols, and semantics, thus abstracting volatility. This is in contrast to compile-time or runtime binding, which requires that you bind the components at compile time or runtime (synchronous calls), respectively, and also requires that changes ... (more)

SOA and User Interfaces

What is unique about an SOA is that it's as much of a strategy as a set of technologies, and it's really more of a journey than a destination. Moreover, it's a notion that is dependent upon specific technologies or standards, such as Web services and interface technology, but really requires many different types of technologies and standards for a complete SOA. The types of technologies you employ are dependent upon your requirement. Let's be a bit clearer as to where user interfaces fit into this SOA mix by providing core reference architecture, or, the basics of SOA. Figure 1 ... (more)

WS-BPEL 2.0: Not Backward Compatible?

Let's face it, WS-BPEL 1.1 was not a great standard, and left so much out that many end users and vendors found it useless. In response, the vendors put a ton of proprietary extensions in their BPEL 1.1-based products, thus diluting its value to the point of "Why bother?" This was a dirty little secret in the world of SOA. Considering that BPEL 2.0 is on the horizon, I think it's time we began to talk about what's really there, how you can fix it, and what you need to do to get from point A to point B. What's most frustrating about the issues here is that orchestration is indeed ... (more)

Building a SOA...

While the notion of SOA continues to emerge, those who are implementing SOAs today are faced with a variety of challenges, including the complexities of SOA, and the work involved with understanding their existing problem domain and requirements. Those who want to get SOA right the first time quickly understand the benefits of a sound architecture and a good set of SOA design approaches. However, the understanding of how you approach your SOA, and best practices around building a SOA, are clearly lacking. Those who are looking to gain the benefits of SOA are perplexed by the wid... (more)