Service Data Objects is a technology that allows

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data to be accessed in a uniform way. The SDO specification was originally developed in 2004 as a joint collaboration between

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( BEA) and IBM and approved by the

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i
JSR 235
Version 2.0 of the specification was introduced in November 2005 as a key part of the Service Component Architecture.

Relation to other technologies

Originally, the technology was known as Web Data Objects, or WDO, and was shipped in

IBM WebSphere Application Server WebSphere Application Server (WAS) is a software product that performs the role of a web application server. More specifically, it is a software framework and middleware that hosts Java-based web applications. It is the flagship product wi ...

5.1 and IBM WebSphere Studio Application Developer 5.1.2. Other similar technologies are JDO, EMF, JAXB and ADO.NET.

Design

Service Data Objects denote the use of language-agnostic data structures that facilitate communication between structural tiers and various service-providing entities. They require the use of a

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with a root node and provide traversal mechanisms (breadth/depth-first) that allow client programs to navigate the elements. Objects can be static (fixed number of fields) or dynamic with a map-like structure allowing for unlimited fields. The specification defines

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for all fields and each object graph can also be provided with change summaries that can allow receiving programs to act more efficiently on them.

Developers

The specification is now being developed by IBM, Rogue Wave,

, SAP,

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Sybase Sybase, Inc. was an enterprise software and services company. The company produced software to manage and analyze information in relational databases, with facilities located in California and Massachusetts. Sybase was acquired by SAP in 2010; ...

, Xcalia, Software AG within the

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Member Section Open CSA since April 2007. Collaborative work and materials remain on the collaboration platform of Open SOA, an informal group of actors of the industry.

Implementations

The following SDO products are available: *

Rogue Wave Software Rogue Wave Software was an American software development company based in Louisville, Colorado. It provided cross-platform software development tools and embedded components for parallel, data-intensive, and other high-performance computing (H ...

HydraSDO * Xcalia (for Java and .Net) *

(Data Service Integrator) , Oracle Data Service Integrator
/ref> * IBM (Virtual XML Garden) * IBM (

WebSphere Process Server IBM WebSphere refers to a brand of proprietary computer software products in the genre of enterprise software known as "application and integration middleware". These software products are used by end-users to create and integrate applications w ...

) There are open source implementations of SDO from: * The Eclipse Persistence Services Project ( EclipseLink) * The

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project for Java and C++ * The fcl-sdo library included with FreePascal

References

{{reflist

External links

Specification versions and history can be found on * Latest materials a
OASIS Open CSA

Service Data Objects

SDO Specifications at OpenSOA

Introducing Service Data Objects for PHP

Computer networking Java specification requests Persistence Service-oriented (business computing)