Dr. Savas Parastatidis is the chief software architect at the North-East Regional e-Science Center (NEReSC), Newcastle, UK. He is NEReSC's expert in Grid Computing technologies and standards. Previously, he co-led an R&D team at HP's middleware division that produced the world's first XML-based transactioning system and represented HP during the early stages of the OASIS BTP standardization effort.
There has been much debate lately on what exactly WSDL's purpose is, and much
of that debate has focused on whether WSDL is an interface definition
language (IDL), or whether WSDL is better used to specify message-level
contracts (without any associated operational semantics).
In this article we present an argument that dealing with WSDL as a
message-level contract description language is the right way to go for
building loosely coupled Web services.
Interfaces and Contracts
Before we delve into the specifics of how WSDL should be used, we need to
understand the difference between a classic interface and a contract. By
understanding the different problems that each solve we can begin to form a
picture of when it is appropriate to use one or the other.
Let's start by brie... (more)
In July 2003 a consortium of Web services vendors released the Web services
Composite Application Framework (WS-CAF) to the community. WS-CAF is
comprised of three specifications that together provide a means of reliably
composing individual Web services into larger aggregate applications. The
cornerstone of this suite is the management of stateful interactions between
Web services that ... (more)
In June 2003, the Global Grid Forum (GGF) adopted the Open Grid Services
Infrastructure (OGSI) specification as a GGF standard. OGSI is essential to
the Open Grid Computing vision as it is the foundation on top of which the
building blocks of future Grid applications will be placed. Those building
blocks, the Grid services, are being defined by various GGF working groups,
with the Open G... (more)
Dr. Savas Parastatidis is the chief software architect at the North-East Regional e-Science Center (NEReSC), Newcastle, UK. He is NEReSC's expert in Grid Computing technologies and standards. Previously, he co-led an R&D team at HP's middleware division that produced the world's first XML-based transactioning system and represented HP during the early stages of the OASIS BTP standardization effort.
Keith Bergelt
Gaurav Mantri
Aditya Banerjee
John Karamitsos
Kaj van de Loo
Bob Little
Alois Reitbauer
Chris Schin
Richard Gordon
Anil Parambath
