Service Component Architecture (SCA) is emerging standard which aims to provide a model for the creation of service components in a wide range of languages and a model for assembling service components into a business solution [1].
The SCA specification is divided into a number of documents, each dealing with a different aspect of SCA [4]. Like, the Assembly Model describes wiring components. The Assembly Model is independent of implementation. The Client and Implementation specification deals with the implementation of services and of service clients -- SCA has published specifications for BPEL, C++, Spring and Java component implementation specifications.
List of current SCA specification can be found at OSOA's website at - http://www.osoa.org/display/Main/Service+Component+Architecture+Specifications. Most of the specifications published in 2007. I am still trying to figure out what is the current status of SCA.
References:
[1] Service Component Architecture (SCA) (http://www.oasis-opencsa.org/sca)
[2] What is Service Component Architecture? Is it an alternative to SOA or is it an addition? (http://blog.softwareag.com/index.php/2008/06/10/what-is-service-component-architecture-is-it-an-alternative-to-soa-or-is-it-an-addition/)
[3] Service component architecture - Wikipedia Page (http://en.wikipedia.org/wiki/Service_component_architecture)
[4] Service Component Architecture (http://www.ibm.com/developerworks/library/specification/ws-sca/)
[5] Service Component Architecture Specifications (http://www.osoa.org/display/Main/Service+Component+Architecture+Specifications)
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