RE: Using <unique> for multilingual elements

Saxon reports no errors in your schema.

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: xmlschema-dev-request@w3.org 
> [mailto:xmlschema-dev-request@w3.org] On Behalf Of Randy J. Ray
> Sent: 08 April 2005 18:35
> To: xmlschema-dev@w3.org
> Subject: Using <unique> for multilingual elements
> 
> 
> I'm working on a schema spec for some open-source work of mine. In it,
> I want to define an element called <documentation>, for obvious uses.
> I would also like to limit it to one instance per scope (it will be
> used at several context levels). Here's the catch: I want to allow
> multiple occurrances if an attribute "lang" is different. So, only one
> *English* version, and perhaps a Russian one, or a Greek one, etc.
> 
> This is the block that defines the complexType:
> 
>   <xsd:complexType id="descriptionType" name="descriptionType">
>     <xsd:annotation>
>       <xsd:documentation>
>         A description block is used to document everything 
> from specific change
>         items to the release as a whole.
>       </xsd:documentation>
>     </xsd:annotation>
>     <xsd:simpleContent>
>       <xsd:extension base="xsd:string">
>         <xsd:attribute default="en-US" name="lang" 
> type="xsd:language" />
>       </xsd:extension>
>     </xsd:simpleContent>
>   </xsd:complexType>
> 
> Here's an example of an element declaration that references a type
> that references the above. This declaration includes a unique
> constraint:
> 
>   <xsd:element id="item" name="item" nillable="false" 
> type="tns:itemType">
>     <xsd:annotation>
>       <xsd:documentation>
>         An item element contains a single block representing 
> an itemType.
>       </xsd:documentation>
>     </xsd:annotation>
>     <xsd:unique name="itemDescriptionLangConstraint">
>       <xsd:selector xpath="tns:description" />
>       <xsd:field xpath="@lang" />
>     </xsd:unique>
>   </xsd:element>
> 
> This *looks* like it should be correct. However, the xsltproc
> command-line tool from libxslt doesn't implement <unique>, yet. I get
> warnings of an unimplemented feature  exactly as many times as I have
> that tag. I haven't been able to get a working Java-based tool for
> plain validation,. so I haven't been able to test it.
> 
> Any advice? Am I on the right track?
> 
> The full schema, if you want to look at it all in context, 
> can be viewed here:
> 
>     http://www.blackperl.com/XML/ChangeLog/changelog093.xsd
> 
> Randy
> -- 
> Randy J. Ray / randy.j.ray@gmail.com
> Campbell, CA
> 
>

Received on Friday, 8 April 2005 18:38:35 UTC