• From: Michael Kay <mike@s...>
• To: xml-dev@l...
• Date: Fri, 30 Mar 2012 17:34:58 +0100

If you don't mind a solution that's tied to one schema processor, Saxon 
allows you to use the XSD 1.1 xs:assert feature, and to call out to java 
from the assertions, so you can do arbitrarily complex procedural 
validation.

Michael Kay
Saxonica

On 30/03/2012 13:35, 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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• References:
  • Validation of complex content
    • From: Edwin Dankert <edankert@g...>