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Subject: [OASIS Issue Tracker] Commented: (TOSCA-21) TOSCA-20 Issue 6: "id" vs "name"


    [ http://tools.oasis-open.org/issues/browse/TOSCA-21?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=30677#action_30677 ] 

Frank Leymann  commented on TOSCA-21:
-------------------------------------

There are other standards that use both, name and id for elements.  For example: W3C (Policy), OMG (BPMN),...  Thus, as I wrote before, this pattern in fact is used in industry. 

Without unique identifiers, references cannot be made - TOSCA is vitaly dependend on references. As you write yourself, users want to have names.  Typically, identifiers are assigend by tooling (e.g. when you drop a node type into a canvas, the modeling tool generates the unique ID for you), names are assigned by humans (the modeler assigns a meaningful name).  In our handcrafted examples throughout the spec, we use the same string for both, the id and the name for simplicity - maybe this is confusing, i.e. we could change it if the TC thinks that this is needed. 

Because I see no convergence of positions here, I suggest to vote on it. 

> TOSCA-20 Issue 6: "id" vs "name"
> --------------------------------
>
>                 Key: TOSCA-21
>                 URL: http://tools.oasis-open.org/issues/browse/TOSCA-21
>             Project: OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC
>          Issue Type: Sub-task
>            Reporter: Tobias Kunze 
>            Assignee: Tobias Kunze 
>
> This issue actually has three possible solutions:
>    1. Keep "id" and drop "name" (or make it optional); same for XML and YAML
>    2. Keep "name" and drop "id" (or make it optional); same for XML and YAML
>    3. Adopt solution (1) for XML and (2) for YAML; define translation between formats
> Aspects to consider are, among potential others:
>    A. Uniqueness of identifiers
>    B. Scope of uniqueness: local to the template or global
>    C. Enforcement or validation of uniqueness
>    D. Familiarity of construct
>    E. Culture ("geeky" vs "user-friendly")
>    F. Likelihood of acceptance
>    G. Simplicity
> During our call on 2012-06-07, is seemed that
> i. There was consensus that (A) is required but (B) only at the local level; import of external identifiers can occur either namespaced or optimistically
> ii. There was consensus that (C) uniqueness must be enforced. However, there was disagreement on where it should be enforced. Derek suggested that implementations should make use of XML's enforcement of the uniqueness of the "id" attribute. I suggested that this could be trivially carried out by the implementation itself, quite possibly with better error messages. Some of the argument may have rested on (D) Familiarity of users with the XML "id" attribute.
> iii. There was a difference in (E) among the TC

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