Re: [xml-dev] XML Design for Diverse Data

[George Cristian Bina <george@oxygenxml.com>]

Hi,

One should be able to obtain the document fragments that go to each 
validate action based on the NVDL script (the result of the dispatching 
part of NVDL).
An XSLT 2.0 implementation of NVDL that performs only the dispatching 
part, that is it extracts document fragments associated with each schema 
is available as part of oNVDL:
http://www.oxygenxml.com/onvdl.html
One can use the NVDL as a filter to get only the desired document 
fragment and pass that for further processing to the code that expects 
only that as input.

Best Regards,
George
--
George Cristian Bina
http://www.oxygenxml.com



Costello, Roger L. wrote:
> Hi Bryan,
> 
> Here's a summary of Bryan's message:
> 
> Consider this XML:
> 
>    <payment>
>        <paymentpart>20</paymentpart>
>        <paymentpart>45</paymentpart>
>    </payment>
> 
> A programmer may write code to sum each value in <payment>, e.g.
> 
>    sum = 0
>    loop through payment
>       sum = sum + paymentpart
> 
> With NVDL new elements may be introduced within <payment> and thus the
> programmer's code may fail.
> 
> Bryan, is that a fair summary?
> 
> Here are some thoughts:
> 
> NVDL changes this content model:
> 
>    <payment>
>        <paymentpart>20</paymentpart>
>        <paymentpart>45</paymentpart>
>    </payment>
> 
> Into this content model:
> 
>    <payment>
>        -- zero or more other-ns elements --
>        <paymentpart>20</paymentpart>
>        -- zero or more other-ns elements --
>        <paymentpart>45</paymentpart>
>        -- zero or more other-ns elements --
>    </payment>
> 
> That is, it changes a closed content model into an open content model.
> 
> Thus, if a programmer writes code assuming the first (closed) content
> model then his code is likely to fail.
> 
> The problem is with the programmer's misunderstanding of the content
> model, not a problem with NVDL.
> 
> What is exciting to me is that NVDL changes all schemas (XML Schema or
> Relax NG) from a closed content model to an open content model, without
> any changes to the schemas!.  To state it a bit dramatically:
> 
>      NVDL unlocks closed schemas!
> 
> 
> Comments?
> 
> /Roger
> 
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