Service Data Objects
Service Data Objects is a technology that allows heterogeneous data to be accessed in a uniform way. The SDO specification was originally developed in 2004 as a joint collaboration between Oracle (BEA) and IBM and approved by the Java Community Process in 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
[edit]Originally, the technology was known as Web Data Objects, or WDO, and was shipped in IBM WebSphere Application Server 5.1 and IBM WebSphere Studio Application Developer 5.1.2.[1] Other similar technologies are JDO, EMF, JAXB and ADO.NET.
Design
[edit]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 tree structure 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 meta-data 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
[edit]The specification is now being developed by IBM, Rogue Wave, Oracle, SAP, Siebel, Sybase, Xcalia, Software AG within the OASIS Member Section Open CSA[2] since April 2007. Collaborative work and materials remain on the collaboration platform of Open SOA,[3] an informal group of actors of the industry.
Implementations
[edit]The following SDO products are available:
- Rogue Wave Software HydraSDO
- Xcalia (for Java and .Net)
- Oracle (Data Service Integrator) [4]
- IBM (Virtual XML Garden)
- IBM (WebSphere Process Server)
There are open source implementations of SDO from:
- The Eclipse Persistence Services Project (EclipseLink)
- The Apache Tuscany project for Java and C++
- The fcl-sdo library included with FreePascal
References
[edit]- ^ "Introduction to Service Data Objects". IBM. Archived from the original on 6 March 2021.
- ^ Activities and announcements | OASIS Open CSA
- ^ Home – Open SOA Collaboration
- ^ | Oracle Data Service Integrator
External links
[edit]Specification versions and history can be found on