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Subject: [ASSEMBLY-88] Possible duplicate functionality offered by constrainingTypeand component - proposed resolution

This is a proposal to resolve Issue 88.

- remove constrainingType from the specification
- add an attribute to <component/> called @constrained which is a boolean value with a default of "false"

- a <component/> with constrained=false is just like a component today - no changes
- a <component/> with constrained=true requires its implementation to follow rules similar to those for
  constrainingType - namely:

"When the component using an implementation has @constrained=true the implementation's component type
MUST contain all the services, references and properties explicitly declared by the component. The component’s
references and services can have interfaces specified and can have intents specified - the implementation's
service interfaces must be the same or a superset and its reference interfaces must the the same or a subset, while
any intents present in the componentType must match those declared by the component.. An implementation MAY
contain additional services, additional optional references (multiplicity 0..1 or 0..n) and additional optional properties
beyond those declared by the component, but MUST NOT contain additional non-optional references
(multiplicity 1..1 or 1..n) or additional non-optional properties (a property with mustSupply=true). (and any such references
will not be wired and any such properties will not be configured by the component). Any services in the componentType
which are not also declared by the component cannot be wired or promoted"

I believe that this allows a component to control what its implementations MUST look like, which is the idea behind

Detailed changes:

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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