[OASIS Issue Tracker] Created: (TOSCA-141) WD02 - Specifying Environment Constraints for Node Templates

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WD02 - Specifying Environment Constraints for Node Templates
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                 Key: TOSCA-141
                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-141
             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
          Issue Type: Bug
          Components: Profile-YAML
            Reporter: Derek Palma


In section 12 Grouping Node Templates, a membership construct is used to associate a TOSCA runtime constraint (a capability not provided by the nodes in the service template but by the environment that is processing it) to a set of node templates, the subjects of the constraint.

The specific use cases is an anti-colocation constraint to ensure two SoftwareComponents are not placed on the same Compute node which is certainly a valid and common use case.

My concern with the proposed syntax is that is that it is not able to support strong validation. This construct should capture the following semantics:
1)	The capability of the TOSCA Runtime to be applied (constrained)
2)	The subjects of the action implied by the declarative constraint


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