Re: [sca-assembly] NEW ISSUE: Need definition of compatible for propertytypes

[Mike Edwards <mike_edwards@uk.ibm.com>]

Folks,

Comment inline...

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

From:	Anish Karmarkar <Anish.Karmarkar@oracle.com>
To:	sca-assembly@lists.oasis-open.org
Date:	07/04/2009 06:28
Subject:	Re: [sca-assembly] NEW ISSUE: Need definition of compatible for property types

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+1 to raising this issue.

The correct line number for [1] is 1045.

Do we really need this feature? Why allow @type or @element on component
properties? 

<mje>
I am somewhat surprised by Anish making this
comment!
One of the usecases of specifying the type
of a property on a component is to ensure
that whichever implementation is used for
that component conforms to the needs of
the component, when building using a top-down
approach.  If the type cannot be
specified, then the composite is forced to
accept whatever type the implementation
decides to provide and no error would get
raised in the case of a mismatch.
</mje>


The implementation declares the type of the property,
it is 
tricky to allow subtypes and hope that it would get mapped correctly and
would be allowed by the implementation/implementation language 
(especially when we want to allow multiple C&I types). Do we lose 
anything by removing this?

<mje>
+1 to disallowing subtypes...
</mje>

-Anish
--

David Booz wrote:
> TARGET: Assembly spec CD03 [1]
> 
> DESCRIPTION:
> Line 1036 of CD03 [1] says that if a component specifies a property
> type, then that type must be compatible with the type of the same
> property in the componentType. What does compatible mean? It might
be as 
> simple as the same type of sub-type (i.e though some form of 
> inheritance), but it needs to be specified.
> 
> PROPOSAL:
> None
> 
> [1] 
> http://www.oasis-open.org/committees/download.php/31740/sca-assembly-1.1-spec-cd03.pdf
> 
> 
> 
> Dave Booz
> STSM, BPM and SCA Architecture
> Co-Chair OASIS SCA-Policy TC and SCA-J TC
> "Distributed objects first, then world hunger"
> Poughkeepsie, NY (845)-435-6093 or 8-295-6093
> e-mail:booz@us.ibm.com
> 

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