Raymond Feng wrote:
> Hi,
> 
> As reported by JIRA issue Tuscany-437 
> (http://issues.apache.org/jira/browse/TUSCANY-437), we should be able to 
> handle SCDL using different XML styles illustrated as follows.
> 
>    <component name="HelloWorldServiceComponent"> 
>         <!-- Style 1: using substitution group -->
>          <!-- 
>         <implementation.java class="helloworld.HelloWorldImpl"/> 
>         --> 
>         <!-- Style 2: using xsi:type -->
>         <implementation xsi:type="JavaImplementation" 
> class="helloworld.HelloWorldImpl"/> 
>     </component> 
> 
> To address this issue, I would like to propose that we provide SPI in 
> LoaderRegistry to register a StAX loader by either the QName of the XSD 
> element or the type. Upon this, the runtime behavior can be:
> 
> 1) First check if there is a loader in the registry under the QName of the 
> element, if yes, then use it
> 2) If no, then try to check if there is an "xsi:type" attribute on the 
> element, if yes, use the value of the xsi:type (QName) to look up the registry
> 3) If neither step 1 or 2 can find a corresponding loader, the loading 
> process will fail.
> 
> Any other ideas?
> 

Sounds good. Are you planning to extend the Loader interface to accept a
 QName and just have the current implementation delegate to that?

--
Jeremy

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