NEW ISSUE (v 1.2): Global domain channels creation inconsistent withpattern established by definitions.xml

Title: Global domain channels creation inconsistent with pattern
    established by definitions.xml

    

    Target: Assembly 1.2 WD 03
    

    

    Description:

    

    The Assembly specification defines a "definitions.xml" file that can
    be used to declare/define constructs that are shared across multiple
    composites. This file currently encompasses implementation types,
    binding types, policy intents, XML Schemas, WSDLs, and so on. Quite
    inconsistently however, global domain channels (GDCs) are defined
    when deployed as part of any composite deployed directly to the
    domain (not as part of implementation.composite). The current
    version of the spec doesn't justify this inconsistency.

    

    Besides the inconsistency, this triggers a number of related
    problems (which could possibly be solved in a different way):

    
      
It obliges the "assembler" who defines channels in a composite
        to know up front whether their composite will be deployed
        directly to the domain, or rather be used as part of
        implementation.composite. If the former, their "private"
        channels may in fact risk name collisions with other already
        defined GDCs.

      

      
Since GDCs are presumed to be shared across numerous
        composites & components, their lifecycle & scope is
        presumably distinct from the composites that use the GDCs, and
        therefore the model should encourage them to be deployed
        separately.

      
When tooling goes to examine a domain contribution to understand
        the domain-level consequences of deployment, it will now have to
        examine all of the composites in the contribution, in addition
        to what it has to do now - scanning the definitions.xml file.

    
    Proposal:

    

    (In abstract form) Remove the text from section 5.8 that describes
    how channels defined in a composite directly contributed to the
    domain define GDCs. Add text which describes how they can be
    declared via definitions.xml.

    

    -Eric.