ISSUE 23: SCA <anyAttribute.../> declarations should use namespace ##other rather than ##any

[Scott Vorthmann <scottv@tibco.com>]

http://www.osoa.org/jira/browse/ASSEMBLY-23

On Nov 7, 2007, at 5:59 AM, Mike Edwards wrote:

>
> (Issue brought forward from OSOA)
>
> Line numbers all refer to the 1.0 SCA specifications published on  
> www.osoa.org
>
> RAISER:  Mike Edwards
>
> DESCRIPTION:
>
> Currently throughout the SCA XSDs, attribute extensibility uses  
> ##any, which means that it is possible to add an attribute on any  
> of the elements defined by SCA irrespective of the namespace that  
> the new extensibility attribute belongs to (i.e. ##other or ##local  
> or ##targetnamespace). This is actually undesirable and it should  
> be replaced with ##other, for the following reasons:
>
>    1. symmetry with <any> extensibility elements in the XSD
>
>    2. seems to be an evolving best practice for extensibility. All  
> the WS-* and related specs that I looked at use ##other. For  
> example SOAP 1.2, WSDL 2.0, WS-RM, WS-Coordination.
>
>    3. preventing arbitrary use of attributes from SCA namepace on  
> SCA elements when not explicitly authorized does not seem right.  
> ie., disallowing <anyAttribute namespace="##targetnamespace"> is  
> important. SCA defines the element, defines the attribute and  
> therefore SCA should say where it can or cannot be used.  
> Implementors of extensibility should get their own attributes.
>
>    4. That leaves the use of ##local. In most cases attributes  
> belong to no namespace as they are considered scoped to a specific  
> element (hence the default value for attributeFormDefault is  
> "unqualified"). I.e., the element QName, to which the attribute is  
> scoped, defines the meaning of attributes with no namespace. For  
> example, the attribute 'local' on sca:Composite element. Since the  
> element is defined by SCA, SCA should control which attributes from  
> no namespace are allowed. Most use of attribute extensibility uses  
> global attribute decl in a foreign NS. For example, xml:lang,  
> xml:id, wsu:id etc. It is not clear why someone would want to  
> extend elements defined by SCA to use an attribute in no namespace.
>
> PROPOSAL:  Use the ##other declaration as defined above
>
>
> 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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