Re: [xml-dev] Getting XSD annotation from matched element

[Michael Kay <mike@saxonica.com>]

On 13/08/2010 13:11, David wrote:
> Does anyone know, if in any XSLT or XQuery (or even Java) 
> library/project/implementation if there is the following capibility.
>
> When using a Schema Aware transformation (or in java say a Schema 
> Aware parser).
> Given a matched node (in XSLT say a <template match="...">  or in 
> XQuery or XSLT a variable referencing a node),
> is there any method, either standard or proprietary, which can return 
> the annotation element from the XSD corresponding to that node ?
>
> The use case of this is I'd like to embed annotations in XSD and use 
> them to control a transformation, and am not sure what tools I'm going 
> to have to do to accomplish this.
>
> Thanks for any suggestions on where to look.
>
>

Well, there's certainly nothing in the XSLT or XQuery spec that gives 
access to any schema information beyond the type-name, let alone to the 
annotations.

In Saxon you could get most of the schema information from its 
representation in an SCM file, which the schema processor can export - 
but not the annotations, which are discarded by the schema compiler. You 
would have to do your own processing of the source schema documents.

Xerces provides programmatic access to its schema components, including 
I believe the annotations, but that would mean (if using Saxon) 
processing and loading the schema twice.

Michael Kay
Saxonica