[OASIS Issue Tracker] Commented: (TOSCA-111) Adding a dependsOn relation should not require changes to the type definition of the target

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    [ http://tools.oasis-open.org/issues/browse/TOSCA-111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33723#action_33723 ] 

Travis Tripp commented on TOSCA-111:
------------------------------------

It seems like it should allow either Node Type of capability type.

I have been looking at similar things and have come across situations where I'd like to intermix Requirement \ Capability Type with Node Types in the source and target.  Why does the spec say that you can't do that?

> Adding a dependsOn relation should not require changes to the type definition of the target
> -------------------------------------------------------------------------------------------
>
>                 Key: TOSCA-111
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-111
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Bug
>          Components: Interop
>    Affects Versions: CSD2
>            Reporter: Derek Palma
>             Fix For: CSD2
>
>
> Current examples show the dependsOn RelationionshipType defined with a RequirementType on the source end and and CapabilityType on the remote end. This syntax forces someone wanting to use a dependsOn relation in a Service Template to have to a add a capability to the target NodeType  if it does not yet have one, resulting in a change in the target's NodeType definition. In addition to being convenient and unnecessary, the "owner" of the target type may not expect users to be changing his/her type when they use it in Service Templates. From a type evolution perspective, this causes a change in the target NodeType, making it a different version than it original definition, which is not the intention (the user is not trying to change any of the semantics of the target NodeType).

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