Wizard API updated!
Tim Boudreau has released a new version of the Swing Wizard library (version 0.997) that fixes the WizardException bug reported in JavaWorld's recent Open Source Java Project profile. The article's examples have been reworked to test out the new, improved WizardException. Thanks, Tim, for this helpful fix!
Open Source Java Projects: The Wizard API

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The power behind the SOA repository

The nature of SOA data requires a native XML data management server

By Ash Parikh, Robert Smik and Premal Parikh, JavaWorld.com, 06/27/05

The basic tenet of a service-oriented architecture (SOA) is to provide loose-coupling for different applications. It is thus imperative that data is produced by and for these applications, and that this data is stored and handled optimally. Given the pervasive nature of each application in an SOA, the way this data is stored is typically location-dependent and specific to the application.

An SOA repository is a mechanism that handles the persistence of distributed SOA data. It is a complex and sophisticated enterprise-grade technology that not only handles persistence and caching, but also enables lifecycle management, security, discovery, and transformation of distributed data from diverse service-oriented applications such as silo applications, Web portals, business processes, and mobile applications.

SOA data is basically transient and streaming in nature. It thus necessitates a native XML data storage that aggregates the data relevant to a specific service, regardless of the applications used, rather than assigning the data to the individual applications that make up that service. Otherwise, data becomes difficult to access and cost-prohibitive to store and replicate.

SOA data is typically stored in relational databases and filesystems, but these are not entirely capable of handling SOA data. Elliotte Harold, in his article "Managing XML Data: Native XML Databases," (IBM developerWorks, June 2005) clearly addresses the need for and benefits of a native XML database. In his words, "When your only tool is a hammer, everything looks like a nail. When your only tool is a relational database, everything looks like a table. Reality, however, is more complicated than that. Data often isn't tabular and can benefit from a tool that more closely fits its natural structure. When that data is XML, the appropriate tool for managing it might well be a native XML database."

Being fundamentally XML, SOA data cannot be easily modeled in relational databases. The inflexibility of relational database schemas does not lend itself well to the ever-evolving nature of schemas in an SOA, and more so when trading partners collaborate across enterprises. Filesystems also do not provide advanced querying and management capabilities, which is a typical need in an SOA. For these compelling reasons, we strongly believe that data created as XML should be persisted, managed, and treated as XML.

Consider the complex and ever-evolving list of Web services standards. They include a number of OASIS initiatives such as Web Services Business Process Execution Language (WSBPEL), Web Services Security, Web Services Distributed Management (WSDM), ebXML Collaboration Protocol Profile and Agreement (CPPA), and Web Services Policy Framework (WS-Policy), as well as numerous World Wide Web Consortium initiatives, and REST-based XML artifacts. Wading through this exhaustive alphabet soup of standards, one realizes that at their core, these standards are basically represented by XML Schemas such as the WS-Policy XML Schema, the Collaboration Protocol Profile (CPP) XML Schema, the Collaboration Protocol Agreement (CPA) XML Schema, further strengthening the case that if SOA data is created in XML, it should be persisted, managed, and treated as XML.

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. great article
By Anonymous 		1 04/22/08 06:03 AM
by Anonymous
. The power behind the SOA repository
By JavaWorldAdministrator 		1 03/06/08 02:37 PM
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