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Subject: Response to the Siemens Public Review Comments on the SCA AssemblySpecification (from Issue 149)




The SCA Assembly technical committee thanks Siemens for its comments on the SCA Assembly Model specification,
as contained in:
http://lists.oasis-open.org/archives/sca-assembly-comment/200906/msg00003.html  

The Assembly technical committee took a decision at its Face-to-Face meeting in December 2009 to take no action
in response to the Siemens comments, with the result that the relevant parts of the specification are left unchanged.

The Assembly TC debated the points made by Siemens about conformance and the requirement for a runtime to
implement at least one of the implementation types standardized at OASIS at some length, with a variety of ideas being  
considered. However, the committee was unable to agree on an alternative approach to the question of conformance which  
did not have the effect of making "conformance to the SCA Assembly specification" a rather meaningless statement.
As a result, the SCA Assembly specification, version 1.1 has conformance that is tied to the use of at least one of
the implementation types standardized at OASIS and which is also tied to the test suite available at OASIS.

The Assembly TC remains open to loosening the conformance requirements in a future release of the SCA Assembly
specification and welcomes input from Siemens and other parties who have useful ideas in this area. One  
significant problem that was debated at length is how an OASIS TC can lay down meaningful criteria for some
future implementation type that does not get standardized at OASIS and require that those criteria are met for any
conforming runtime.  A similar associated problem exists for the Test Suite, since although the Assembly test suite is
carefully structured to be as independent of implementation type as possible and is also easily adaptable to a new
implementation type, an executable version of the test suite inevitably involves at least one implementation type -
ensuring that a valid test suite exists when using that new implementation type has proved particularly problematic,
since passing the test suite is one of the conformance requirements.


Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com





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