• From: George Cristian Bina <george@o...>
• To: Edwin Dankert <edankert@g...>
• Date: Wed, 04 Apr 2012 21:56:39 +0300

Hi Edwin,

You should look also into Relax NG datatype libraries - basically you 
can define a type for your expressions and write an implementation for 
that datatype for your Relax NG processor, Jing for example, then you 
should be able to use that from a Relax NG schema.

Best Regards,
George
--
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

On 3/30/12 3:35 PM, Edwin Dankert wrote:
> Hello,
>
> I hope you can guide me in the best way to proceed with this validation issue.
>
> I have a XML structure with most of the nodes representing simple
> data, like names, references and numeric values.
>
> <person>
>    <name>John<name>
>    <salary>1000<salary>
> </person>
>
> However some of the numeric nodes can not only represent the data as
> simple numeric values, they can also be specified as an expression and
> point to other items in the document.
>
> <person xmlns="x">
>    <name>John<name>
>    <salary>100000/$no-of-employees}<salary>
> </person>
>
> The expression language is quite complex and cannot be represented by
> a regular-expression. The syntax is however specified using EBNF and
> only the syntax needs to be validated.
>
> A XML Schema for this exists:
>
> <schema>
>    <element name="person">
>      <sequence>
>        <element name="name" type="Name">
>        <element name="salary" type="string">
>      </sequence>
>    </element>
> <schema>
>
> The goal is to have a standalone tool which can validate using the
> more simple constraints specified by the schema and also validate the
> values which contain the expression language.
>
> My preferred solution would involve validating the expression value
> syntax directly from the EBNF using standard XML technologies but
> don't believe this is currently an option.
>
> My questions now is: what would be the best way to validate these
> values in your opinion or how was this solved in any of your previous
> projects? (Note: The validator tool-set already includes Java, NVDL,
> XSLT 2.0, XML Schema 1.0.)
>
> Any suggestions are very welcome.
>
> Thanks in advance,
> Edwin
>
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