The OASIS Open Composite Services Architecture (Open CSA) Member Section advances open standards that simplify SOA application development. Open CSA brings together vendors and users from around the world to collaborate on standard ways to unify services regardless of programming language or deployment platform.

Open CSA promotes the further development and adoption of the Service Component Architecture (SCA) and Service Data Objects (SDO) families of specifications. SCA helps organizations more easily design and transform IT assets into reusable services that can be rapidly assembled to meet changing business requirements. SDO lets application programmers uniformly access and manipulate data from heterogeneous sources, including relational databases, XML data sources, Web services, and enterprise information systems.

Everyone is invited to participate in the work of Open CSA, which is produced under the OASIS open standards process. Open CSA encourages the proliferation of compatible implementations by providing its specifications to the community on a Royalty Free basis.


11 April 2007
OASIS Forms Open CSA Member Section

21 March 2007
Leading Technology Vendors Announce Completion of Specifications Designed to Simplify SOA Application Development: Open SOA Collaboration Chooses OASIS to Advance SCA and SDO Specifications

26 July 2006
Leading Technology Vendors Extend Collaboration on SOA Technologies

30 November 2005
Specifications - Service Component Architecture (SCA) and Service Data Objects (SDO)


Find answers to these frequently asked questions on Open CSA.

What is the OASIS Open CSA Member Section?

Open CSA is an independent group that works under the open process of the OASIS international standards consortium. Open CSA members collaborate to advance open standards that simplify SOA application development.

Who are the members of Open CSA?

Open CSA members represent all serious stakeholders in SOA application development. Software, hardware, and services providers, user companies, government agencies, systems integrators, and other interested parties are invited to participate in this work. Anyone is welcome to join, and anyone employed by an existing OASIS member may participate in Open CSA without additional dues or cost.

See Open CSA Members for a current list of organizations that support this work and Roster of Participants for a list of people who are involved.


What kinds of activities does Open CSA undertake?

Open CSA concentrates its intial work on the Service Component Architecture (SCA) and Service Data Objects (SDO) families of specifications. The Member Section supports the process of:

  • gathering requirements
  • developing specifications
  • coordinating the work of its affiliated OASIS Technical Committees
  • providing the governance structure to accept and manage funds to serve its work
  • As standards in this area mature, Open CSA also supports adoption and implementation efforts including development of:

    • test cases
    • testing procedures
    • interoperability testing
    • demonstrations

Does Open CSA encourage participation from the community?

Yes, everyone is welcome to participate in Open CSA's efforts to advance standards for simplifying SOA application development.

See Join Open CSA for instructions on how to get involved and Join OASIS for information on membership benefits, categories, and dues. 

Documents and archives of mailing lists for Open CSA and for OASIS Committees are publicly accessible, and the community is invited to participate in public reviews and provide comments to the Committees.


What are the group's operating policies?

Open CSA operates under the OASIS Open CSA Member Section Rules of Procedure. The Member Section is subject to the OASIS Bylaws, Member Section Policy, IPR Policy, Technical Committee Process and other policies and procedures.

How is the OASIS Open CSA Member Section governed?

Open CSA activities are managed by a Steering Committee that consists of seven members. Each member serves a two-year term. For consistency of management, terms are staggered so that four seats expire one year and the other three expire the following year.

Steering Committee representatives are nominated and elected by the Open CSA membership in an open process. The selection of the Steering Committee is based on individual merit and is not tied to financial contribution, corporate standing, or special appointment.

What do the SCA and SDO families of specifications cover?

The SCA and SDO specifications both aim to provide elements of a programming model for building systems which use a service-oriented architecture.

SCA provides a way of describing the structure of service-oriented solutions. It uses service components as the basic building blocks, where a service component offers one or more services and optionally makes references to services supplied by others. One or more service components can be composed together using a composite which not only defines anc configures the components, but also wires together their references to services which resolve them. Composites can also apply specific bindings to wires (eg Web services) and also apply policies that determine how wires are used (eg applying encryption to messages flowing between a reference and a service).

SCA aims to encompass a wide range of technologies, including many programming languages that may be used to implement components and also many types of binding that may be used for communication.

SDO defines a programming model for accessing data in a service-oriented architecture. It provides a standard way for the programmer to deal with data whatever its source or target. For example, it can handle data from an XML document or it can handle data from a relational database. SDO also supports a disconnected data model, where data can be extracted from its source, manipulated by a client program and then updates sent back to the source, without the need to lock the source data. This is often a more satisfactory approach in handling serivce-oriented architectures.