Re: [opencsa-liaison] NEW ISSUE: Use of Schematron in SCA Specifications

[Anish Karmarkar <Anish.Karmarkar@oracle.com>]

I should mention that RelaxNG was also mentioned in this context.

-Anish
--

Mike Edwards wrote:
> 
> RAISER:  Mike Edwards, on behalf of the SCA BPEL TC
> 
> TARGET: All Specifications which define XML structures via XSD
> 
> DESCRIPTION:
> 
> An issue was raised in the BPEL TC which proposes the use of Schematron 
> for expressing constraints which cannot
> be captured using vanilla XSD.  It is true that SCA specifications quite 
> generally have constraints of this kind.
> 
> The question for the liaison committee is: should Schematron get adopted 
> by all of the SCA specifications for
> expressing constraints on XML structures?   It would seem preferable for 
> this to be all-or-nothing for the SCA specs
> as a whole - either they all use Schematron or none of them should, for 
> consistency sake.
> 
> 
> 
> Here is the original Issue as raised to the BPEL TC:
> 
> --------------------------------
> DESCRIPTION: There are several places in the document where we make
> statements limiting the usage of our defined XML items.  An example from
> Section 3.3, where sca-bpel:service and sca-bpel:reference are defined:
> "A process MUST NOT include both attributes on a single partnerLink."  
> This kind of restriction can not be encoded in XML Schema intuitively,
> so we don't.  Furthermore, there is an implicit restriction that these
> attributes are only to be used on a partnerLink, but again, we don't
> state that formally.
> 
> PROPOSAL: Define SchemaTron rules in our specification that formalize
> the constraints that are now limited to either informal verbal
> constraints, or implied constraints.
> ---------------------------------
> 
> 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        
> 
> 
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