[ASSEMBLY-244]: How to enable extensibility to multiple bindings on achannel

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

Logged as: http://www.osoa.org/jira/browse/ASSEMBLY-244


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:	Eric Johnson <eric@tibco.com>
To:	OASIS SCA Assembly <sca-assembly@lists.oasis-open.org>
Date:	27/09/2010 20:25
Subject:	[sca-assembly] NEW ISSUE: How to enable extensibility to multiple bindings on a channel

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Target: 1.2 WD 01 + resolution of issue 241

Title: How to best allow for an implementation to extend channels to allow
for multiple bindings.

Description:

At the September 2010 Face-To-Face meeting in Portland, we decided that
channels, at least as defined in the standard, can have but one binding
element.

The problem is that some implementations may wish to support multiple bindings
on a single channel.  At the moment, they can do so by defining extension
elements.  The cost here is that if an SCA end-user attempts to move
that composite to another implementation, those extension elements may
be discarded, rather than being recognized as fundamentally incompatible
or different.

Proposal:

One possible solution to resolve this is to make the channels themselves
the extension point, so as to enable implementations to explicitly model
and constrain what might appear under the "channel" element in
serialized form.  That is, instead of "channel", we could
define "channel.sca", and allow for "channel.other".

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