[ome-users] STD.xsd - is this a bug?

[Ilya Goldberg]

On Jul 22, 2005, at 10:32 AM, Graham Klyne wrote:

> I'm looking at the following fragments in STD.xsd, and can't make 
> sense of them:
>
> [[
>                 <unique name = "SemanticElement">
>                         <selector xpath = "STD:SemanticElement"/>
>                         <field xpath = "@Name"/>
>                 </unique>
> ]]
>
> [[
>                 <keyref name = "FieldIDref" refer = "STD:FieldID">
>                         <selector xpath = ".//STD:SemanticElement"/>
>                         <field xpath = "@FieldID"/>
>                 </keyref>
> ]]
>

These XPaths are probably bugs and shouldn't be in there.  Can you do 
us a favor and register a bug in bugzilla for this:
http://bugs.openmicroscopy.org.uk/

The idea is that element names within a type should be unique, and that 
semantic type names within a DB instance should also be unique.  I'm 
definitely not adept enough in XPath to enforce this, and this is 
probably a vestige of my weak and pathetic attempts.

I would recommend looking at example STD declarations.  The entire 
ome.xsd schema has counter-parts in STD documents in src/xml/OME/Core.  
Additional STDs that are not part of ome.xsd are in other parts of 
src/xml/OME.  These are not just examples - they're loaded during 
installation and serve as the mechanism by which we build the DB 
schema.
-Ilya


> In particular, by my understanding, the selector child elements match 
> (select) elements named STD:SemanticElement in an instance document.  
> But the schema does not, as I read it, allow for any such elements.  
> The only definition of name SemanticElement in the schema is as the 
> name of the <unique> element quoted above.  I don't see how this can 
> legitimately be the target of an xpath expression.
>
> I'm not expert in the finer points of XML schema incantations, so I 
> could be missing something here,
>
> #g
>
>
> ---
> Graham Klyne
> Image Bioinformatics Research Group (http://www.bioimage.org/)
> Department of Zoology, University of Oxford
> South Parks Road, Oxford OX1 3PS, UK
> E-mail: <Graham.Klyne at zoo.ox.ac.uk>
> Direct phone: +44-(0)1865-281991
> Departmental fax: +44-(0)1865-310447
>
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